You must first be aware that you are asking a question about investing in Bitcoin in a forum that brings together people who generally have a positive opinion about Bitcoin. Of course there are some exceptions and trolls, but most will advise you to invest in BTC if you can afford it - in the sense that you only invest money that you are willing to lose. Consequently, I would not advise you to take loans or sell a house or apartment to make an investment

As for whether something is safe, I would say the only safe thing in the world is that everyone dies sooner or later - everything else is a risk you have to learn to live with. You have to ask yourself if you really understand Bitcoin, why you want to invest and how much money you have - and when you put it all in your head, you will get the answer to your question.