second: use it when you need it.
for example i do not play in a regular band, but regularly in sessions.
sometimes i do not know the name of musicians i play with, very very cool in my opinion.
to have a common set of tunes for sessions is simply stupid.
third: "have fun"
- practice at a session: take any tune, start with the first bar, do it, play with it, advance to the second, again play, end when the whole tune was played (or sometime else).
- useing a realbook does not mean playing the 30+ tunes everyone does. reading a book means reading every page, not every 10th or so.
- playing music without listening to the original, is a lot of fun, and the most might be if you listen to the "original" afterwards. trying to find your way by always referring to others is ...
all the best