yeah I know that . And like you said, has to be done on locks you actually own.Buying an actual set can be a legal grey area depending on your country, so make sure you check that first.
To start off with, all you'd probably need are two picks: a classic short hook and a rake. See this pic (forget about the top one, just the bottom two).
The rake works like it sounds; put a slight tension on the lock with your tension wrench, then just shove the rake in and rake it back and forth. The idea being that most locks are so badly made with such loose tolerances, that simply jostling the pins around will get them to stick and and unlock. I've found that most locks outside are so badly cared for that you can almost accidentally unlock it by simply pretending the rake is a key. Literally insert and *oops* it's already open it really highlights how silly it is to think of something "locked" as "secure".
The other one is for when the rake doesn't work and you need to set each pin individually. Mr Towne will give you tons of great tips on how to feel out pins
edit: and I should add, start with a lock that doesn't have a massively long key; any of the usual brass little locks are great to start with.
I've looked into it a little bit a few months ago, and thought about getting one of the smaller sets with different picks + tensioner + rake, and a practice lock (like ones that are cutaway) just to get used to how the pins work.