Good thread Emma,
It does get easier, plus all the above !
Some things a friend & I keep telling ourselves, which helps us deal with steadily decreasing stagefright. Although you do have to try to select music that you think the audience will appreciate - we think it's important to make sure it something YOU are happy to perform, something you can get really get into. Enthusiasm/enjoyment & getting the essence of a song across will be more apparent to most people in the audience than minor technical details.
As you did - Start with something you can do on auto-pilot, nervousness reduces (our) skill levels - so get the first one down & you're well away.
Learn from the less than wonderful but : Remember your successes.
Hilary