welcome! you should like that mini, i love mine! there are a few posters hanging around that can help you with just about any question related to your mini and then some.
i think you should check out a thread below called barrel conditioning. it was made by steve4102 who has forgotten more than i will ever know about minis. while i don't think it is necessary to break in the barrel, it could give you good results/improvements on your accuracy.
before you do any serious tests on accuracy, run a few hundred through it and enjoy it. oh! and lets see your b-day present in the gallery!
ps-i have never gotten a b-day present that good!