I have never had experience with angels and I was able to take apart mine completely, wash the frame and body, relube and put everything back together just fine and it still worked. Only thing is it takes a while to completely tear down an Angel, at least for me haha.
As dr. said, just look through the sticky. I was able to take apart mine by just looking at manual diagrams. Instead of buying the video, buy the toolkit you'd need to take out the rammer, LPR and such.
Also I had a couple issues during my first few days of having it, mainly the hammer and LPR which gave me more practice. Sometimes troubleshooting can be your friend in these situations