Glad to offer some advice:
1. varies ... I've had girls go preggo with 1-2 locks, and others re-absorb after 10+ locks
2. tail wagging? I've seen it a few times, its actually really cool. But breeding 14+ girls, don't have time to observe the mating dance. In your case, would not worry if you don't see these overt signs. But pay attention, don't worry so much about tail wagging, but do record locks ... I do. Also make sure your heat is <90degrees or you could kill off the sperm. I learned the hard way ...
3. patience - absolutely! I just had my Lav-Albino 66% PH Dream lock with my Dbl Het Dream after five fruitless years. So anything is possible, and they will surprise you.

hope this helps ... if you've seen locks already, then you are on the right trajectory! good luck!