You should go for any investment only after gaining complete knowledge about this subject.
If you want to get all complete knowledge before you can start accumulating Bitcoin you might end up not getting started, the best way is to get started if you have your discretionary income ready, one of the best way to learn is to first get started for you will understand it more better as an insider than been an outsider as you can be accumulating Bitcoin and still learn along the process, Bitcoin investment is not very hard as most people think it believe you can start accumulating once your discretionary income is ready with the little basic knowledge you have about Bitcoin investment.
If someone has extra money that is not going to affect their daily needs or emergency plans, it's fine to start gradually. With the little knowledge they already have, they can start and learn more as they go along, sometimes having the experience is good, and being inside the game helps you understand it even more better than just watching people investing or reading about it from the outside. Some people will never start because they think they will have to learn everything about Bitcoin. While it does not work that way, we keep learning as we go, and even those who have been in it for years are still learning new things
as well.