The first time I took one apart, after several frustrating hours I really thought I was going to have to take it to a gun smith to have it put back together. I created some new swear words that day.
It took e about 4 1/2 hours the first time. About an hour the second. Then it got easy. No big deal now. I don't fear it at all. I loaded it to my brother so he could take a gun safety course. He said I'll clean it before I bring it back. LOL. he watched a few on line videos and just brought it back.