As long as your hands and arms aren't anchoring the guitar in place; they need to be free to play without holding the instrument up. Your strap needs to be adjusted so the guitar is correctly suspended in perfect playing position. Whether sitting or standing.

You need to make healthy playing habits and good posture second-nature for the long-term.

Originally Posted by: guestpostideas46

Most of the advice I've seen and read about strap height said that it's best to set your strap height so it's in the same position when you're standing as when it's on your lap.

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Good advice!

[quote=guestpostideas46]

I'm sitting with the strap around my neck...

Why is it around your neck? It should be resting, comfortably, on your fretting hand's shoulder