A very good site for AMT information is here:
http://glossover.co.uk/amt/downloads.asp
And yes, to take down the .380 Backups, you had to remove the bolt pin with a punch, pull back the slide a bit until the firing pin and spring fell free, then then using a rod inserted up through the magazine well, tapped on the bolt until it fell free. After you do it a couple of times, it goes quickly, and was easier for me than trying to detail strip and reassemble my Ruger Mark II pistols.
As posted elsewhere, I have several DAO Backups, all bought new in the 1980's, and they have all worked very well for me.