I also learned how to play the piano and the violin when I was younger. Looking back, I wish I would have stuck with piano. However, violin is hard for a deaf person to play cause would really need to hear what you are playing and making sure finger and bow is in right place.
That is not really needed for piano since if kept in tune at all times by a tuner, it should be fine as long as finger is in right place.
As for lipreading. I find it is very hard to do if I don't wear my hearing aids. I also find that once you ask them to repeat it, they get frustrated almost immediately and that makes it even harder. It does take practice and it also depends on person. Some I can read very well while others is very difficult. I can't tell why but that is the way it is.
One thing I find when I don't wear hearing aids is that I tend to be quiet and be more observant and also is left alone more often. I am finding myself liking that cause I don't say anything that gets me in trouble. 
