About lockpick and arrow limits: I always feel that they're too limited. A combat-focused thief, who uses a bow all the time, may very well carry more than one quiver. That still means you can't carry more than 60, or maybe even 90 arrows, but STILL. 

And while a master thief may have this cool little kit with 25 picks in it, a complete novice will probably actually carry a bag full of picks because he just doesn't know how to properly pick a lock. You could try to start using the sweetspot sound only after reading two or three skillbooks. (after which you don't need more than 25 picks)

I do love the guide though, especially the part about planning your heists!