How long would you say it takes to get "efficient", or even good, at attaching/removing the piece on your own??

To be honest, different people tend to pick things up faster than others. Having said that, its not rocket science. It could take a few weeks to a few months. You really should read the old forum, as much as possible. IT has everything you need and 1000 times more. By all means ask away, though to be honest, the real, practical learning will come with your own trial and errors. These suckers can and do look really amazing, but it mainly looks amazing from your own tweaking styling. Cant rely on anyone else. thats MHO.

Sam