Finally, should I do it now that the price is not stable or I should wait a little in case it goes down again? We are all here to learn.
I love comfortability ad that's why I think it's best to start when you'll be comfortable starting. Don't make your decision based on what others have said, only learn things from their own experience and make use of it so you don't make the same mistakes they made during their time but in as much as you do that, only invest when you're ready and make use of extra cash that will have no emotional impact on your life if you were to lose it.
You can start accumulating Bitcoin today and you'll be among the smilers tomorrow because of the price of Bitcoin. There are so many ways you can decided to be accumulating your Bitcoin but always be sure you aren't storing those Bitcoin the exchange as not your key no your coin. Anything on the exchange is as good as lost. Get yourself a wallet that you own your personal key. Make sure the wallet is open source and not closed source.