Just got my sch book and the main piece of personal advice I gave myself is to remember that the rng is the rng, which mean you may get one right after the other (like i was lucky enough to have happen last night) or you might not get one for 30 hours. If you go into this expecting to get them all in a timely manner your going to end up upset and frustrated. This doesn't mean you can't try to farm them just don't have unrealistic expectations.