Bitcoin is not used by the users what is meant for we are using as money making product buy just dumping and bumping so if the user want to spend his bitcoin without converting it into fiat is not possible yet.

The common challenges for a bitcoin user are;

Legalization of the Digital Currency: Bitcoin and Altcoins. It is a fact that cryptocurrencies are not accepted and legalized by the government. Thus, it can be a hindrance to a bitcoin user if the government of the country where the user lives suddenly bans the use and being involved to cryptocurrency.

Fluctuating Bitcoin Prices. It is one of the toughest struggle of a bitcoin user could ever face, especially if that user is also an investor who put a huge amount of capital or everything they have. It's hard to get by and convince yourself to be patient if you see the price of bitcoin fall off more as time goes by and even harder to make decisions whether or not make investments during a time of hope considering in mind that it might be  only for a short term. However, if you're a firm believer of the potential of Bitcoin to produce huge profits then facing this problem can be tolerable to you than others.

Insufficient Knowledge and Troubles regarding Policies of the Forum. Being a beginner or newbie in this industry requires you to do a lot of catching up. Enthusiasm and hard-work are essential values for an user to be able to gain knowledge and preventing the user to be left behind. Given the fact that the are changes to the policies of the forum like the merit system makes it more challenging for the users of different ranks to get to the next level of their ranks.

Personally, the common challenges of a bitcoin user that may encounter within thyself is time management, patience and dedication.

Bitcoin has brought innovation in the world of financing  yet being faced with threats from the banks and some governments. One of the challenges is that in the absence of internet, one cannot access his wallet to make a transaction especially during an emergency. Anyway, Bitcoin is still being developed each day. We hope to see an era when Bitcoin can be used offline.

Several sites and businesses have started surrounding their businesses with bitcoin and altcoins. Funds transferred reflects immediately and it’s an open source transaction. I supposed that it’s just the usage that may be the challenge but more importantly, the volatility of the currrencies is really a challenge because it can go for or go against the investor. So, the price variation is usually a challenge for most cryptocurrency users.

The most common challenges for a new user is finding out which wallet to use and how to use. And the most common fear for them is what if they send their bitcoins to the wrong address or lose their private keys. I think if a general tutorial was made for newbies and stickied than it would be great.

High volatility, high fees and slowness make Bitcoin challenging for me. Lightning network has potential to improve coin and make it much better for everyday use.

I think many of the challenges problems we face when we use bitcoins. I am sure that there is a lack of awareness among the general public and Bitcoin users. In some cases most people believe that it is illegal to use Bitcoin or it is a kind of scam or MLM scheme and the guise of other scams. In other cases, we know what happened recently after the rally, there was a wave of panic sales in the market and most newcomers experienced it.
 Actually We should build more understanding and raise awareness about Bitcoin and crypto on the ground to instill the habit of using it as a payment system. I believe that we must work on a priority on our individual level. All of these things we have to build but need a process.

I think the only challenge facing to all bitcoin users is that, the ups and downs of the price in which we cant help about it and the only thing we can do is to take a RISK, we can face and prevent it by accepting the fact and thats the reality ,dont lost hope and not giving up to take the challenge.

Here are my answers and opinions regarding your question.

1.What challenges are facing bitcoin?
- In my opinion, acceptance is one of the challenges that bitcoin is facing. Yes. there are many retailers, particularly online, through which consumers can pay for transactions in bitcoin, but the digital currency still isn't anywhere close to being widely accepted.
Next is, volatility. I believe the price is going to need to become much more stable.
And third, Tax issues. Bitcoin and other digital currencies is considered to be "intangible property," which means they're subject to capital gains taxes. Which we all know, it is one the issue of every government worldwide.

2. How we can prevent it?
- To prevent it. we, the current bitcoin users and community must promote, support and continue to prove that bitcoin has a high potential as a digital currency and has good usage among the community and it will benefit all people.

3. how we should face those challenges?
- As I have mentioned above, we must continue to support and promote bitcoin and other cryptocurrency for its complete acceptance.