I am a good amature guitarist, basically. I have good technical ability, am very musical, ALOT if theory knowledge, and have good practice ethics. (Probably from studying classical piano for 11 years. I'm 16.)

1) I have been running across phrases like "sweep picking" etc...and I have no idea what this is. There are other phrases I am unfamiliar with as well..maybe someone could give me a quick rundown?

2) I have never been to a guitar teacher, and am the best guitarist i know. (And I am not that great). I need help with my grip on the pick, so I dont have to change my grip around when I pick squeal/ping a note. I dont have time when speed riffing to change grip to sqeal. Help please?

Any help is appreciated.