How to not get lost during bibliography research?
I believe you are on the right track. Of course you don't need to read everything, only what is more important for your research. Hence, the most important thing would be to be focus for long periods of time and not to question the time spend. AT first, probably the best start would be to read  the review articles, which discusses different approaches in the field, and then to move to a particular direction. After one have an onset of the phenomenology one can start to digest the mathematical details, and to find the most pedagogical papers which explain the basic details. Do not hurry in your research, keep in mind that there are also research projects also for long time, for 2-3 years for example, or even for decades. Looking at my senior peers, I think the best thing would be to have an continuous effort for many months, every-day(of course, you can take short vacations). Finally, getting lost in the literature makes you adapt more quickly to changes and to different ideas, it is a normal thing.  Good luck!