Get a worn out, discarded or cheap second hand release aid from somewhere and take it to bits carefully on a sheet of cloth to stop bits rolling about, examine it, carefully study any wear marks, play with it. Put it back together. Take it apart again, adjust it, understand it, get to know it... (You don't have to talk to it or take it out to dinner
)
You may need to buy a few tools, but it will be a lifelong investment and you will feel really good if you can get to grips with it and aquire new skills. Even if you can't, you will at least have tried, which is more than many.
Having practiced on that you can become your own expert confident to tackle your own equipment.
PS:-
Two handy tips.
1. When dissmantling something you are worried may have springs and balls and stuff that may spring out, you can always do it with the object and your hands in a large plastic bag.
2. Take pictures of it at the various stages of dissasembly.
Del
(From a saftey point of view, one should know how to maintain such a device).