Using snap guns like the one you have pictured isn't a very good way to learn the intricacies of picking locks.
In fact snap guns require a specific practice and technique to use effectively and cannot be used on more
advanced styles of locking mechanisms. Snap guns are most effectively used by people that already have a
good understanding of how to pick locks for the simple reason that they don't always work the way you want
them to on a lock and you will then have to resort to picking the lock manually if you wish to open it.
Do you already own a set of manual picks? If not I recommend that you search for a good basic set, or craft
your own home made picks by following some tutorials here on site. Once you acquire some picks, start with
digital_blue's exercise so you can start
learning at the beginning instead of skipping ahead.
Snap guns are, in my opinion, more of a shortcut tool to allow someone such as a professional to quickly open
a lock to complete their job and then move on to another.
Are these Kwikset Titan series locks? If they are, they aren't a particularly good place to start learning. I don't
know very much about them since they seem to be quite rare in my local area. The little that I know is that
they are 6 pin locks instead of the more common 5 pin locks, and they may even contain some picking resistant
features, in which case, you ought to find another lock.
Also, and this is the more important part, are these lock currently in service? To clarify, are they being used in
any way on your home? If they are, I -strongly- recommend that you do not pick them or do anything else to
them besides using them normally with a key.