I think if you learn it all you better watch out... something will sneak up on you. When you quit learning you get rather dull..... There is so much to learn. My sister and I were just talking about a couple years ago when we worked up the nerve to pull a bent needle shaft off a machine and trade it out for a donor. She didn't tell me she didn't have a clue what to do. She just sat there and told me I could do it... Here I thought she was reading the manual and telling me what to do. She said she just kept track of where I was. She said she was totally lost otherwise. Then she said she hasn't had to do one but she knows she could. I probably have only seen the Davis VF at Glenn's place. There really is a lot to learn.