Vibrato helps fretted notes sustain longer and gives them more presence. Why should the technique be reserved for the violin or cello? It's a great technique for the guitarist to add a bit of sparkle to the music.
Hopefully this video will give you a few pointers to make sight reading, and learning notes in the high positions, less scary.
Stopping notes and playing rests
Articulation and clarity are always a concern when playing the guitar as notes ring on. Here are some tips to avoid the music sounding muddy... not just stopping the notes at a rest, but stopping the open strings ringing beyond their written duration.
Tasto and ponticello
It is essential to add colour to the sound made on the guitar - the most straightforward way is to vary where along the string the right hand plucks. This variety creates interesting contrasts and brings the music to life. Julian Bream is a great inspiration to this approach.
Here's something we're all experts at!
Hopefully the tips in this video will help hide mistakes but, more importantly, perhaps reduce the risk of them ever happening.