Wed Jul 30, 2014 3:07 am by Harvey
I'll be honest, good luck with the GOSO set. I acquired that same set about 7 years ago, and haven't used them for anything more than letter openers. They do alright in this role.
I would suggest to someone learning to get a consistent lock. This doesn't mean expensive, but something that is consistent in manufacturing, that you can establish a baseline with. See the usual suspects, like Master locks.
While these are by no means high quality or especially hard to open, they are at least consistent. Generally free from obvious defects, and can be relied upon to be mechanically sound.
The lock you have (especially at that price point, and obvious quality levels) may not have worked well brand-new off the shelf, so attempting to practice on something inconsistent will cause you all manner of problems.
Keep it simple, work your way around the concepts and learn on a level that's applicable to you.
There's no point diving head first into a problem where you're wasting hours and hours every week with no signs of payoff or learning. This sort of thing usually ends in a burn-out, where you're investing time and seeing no returns - sooner or later you'll lose motivation and stop.
To someone with some years behind them, these sorts of problems usually have a few answers (ie; cut the lock off), but in instances where such thing is just not applicable (ie; antique lock, can't be replaced, needs to be put back into service same-day, etc. etc) the skill to be patient, observe the entire situation, calculate the possible problems and diagnose the fault that's leading to the visable symptoms is a fine skill to have, but it takes years of daily experience and learning.
Just take it slow, put that lock aside and practice on another until one day you'll realise "OH, of course it was x that I wasn't doing" etc.