That first master lock you pick can be very tricky with a short hook. It is good for learning tension control and avoiding over setting of pins.
Also over setting pins does not always mean you have to start over. With some locks you can let off just a little tension and get the bottom pin to drop and the keep the top pin set. The bottom pin falling sound different than both pins dropping.
Also I have a cheat for you:

. On that first master lock the battarang pick will often open them in about 2 seconds.