#1
When changing guitar strings, replace and tune one at a time, starting with the thickest. This maintains the tension on the instrument. You will have less trouble retuning because the guitar does not have to stabilise again. Also reduces risk of error when selecting string / tuning peg.

#2
The further away from the fret you place finger, the harder you need to press on string to obtain a clean note without fret buzz. Minimise playing pain by placing fingers close as possible to, but not touching, the frets.

#3
When purchasing a guitar try wearing it with a strap, standing up, to ensure the headstock does not dip when you let go. If it does the guitar may be inadequately balanced and unsuitable for your requirement as the neck will need continual support whilst played standing. This particularly applies to bass guitar with long neck and heavy headstock.

#4
Guitar chords for backing blues harmonica, such as the Hohner Special 20 Blues Harp, require "crossed keys" e.g. blues harmonica key D guitar key A.

The key of the blues harp is usually the lowest note it can sound.

The easy live gig way is to find key of blues harp on the A string then rhythm guitar plays in key of note found at same fret on E string.

I find this to be useful during Rhythm and Blues pub gigs when guest blues harpists appear.

Don't let cross keys make you angry ;)

More of Bob's guitar playing tips at: www.houlston.freeserve.co.uk/guitar.htm