In reply to Italian_Blend:
I think you're over thinking this...
Go on holiday.
Chose a nice multipitch that is
-> easy (ie a couple/few whole grades below your onsight grade).
-> not too long or committing
-> easy to get down from
-> no route finding problems
-> not in the middle of nowhere
Plan for plenty of time (ie get there early), take a head torch if there is the remotest chance you'll need it. Take a few extra bits of gear. Take a nice packed lunch and plenty of drink. Consider if you need descent shoes. Try not to drop anything. Use a guide plate. Know how to belay and ab without your belay plate. Remember to use sun cream before you set off (seriously - there's little worse than burning to a crisp with no prospect of shade for hours en route, don't forget your calves/heels which will be in the sun all day and are probably not ready for the UV). Take a hat (helmet) Consider if you need to pack a jacket.
Pack a bit of abandon gear each (a maillon or burner carabiner) - you'll probably never use it but the minor reluctance you'll get from abandoning something nice is not worth factoring into the difficult decision you'll need to make.
Enjoy, repeat and work slowly up the difficulty / length / faff / route finding / retreat scale.
Agree a system of communication if verbal doesn't work. Do this before you leave the ground. Do it every time you climb (seriously - it's quick and easy and if either of you has forgotten or climbed with someone using a different code it can make a lot of faff). Or use walkie-talkies if you have them.
If the event something off-plan happens that gives you a decision between doing something dangerous or seeking help - seek help first - it's usually available.
Try not to get your abseil rope stuck in a tree (other entanglements available).
If you're nervous start with a few 2 pitch routes where you can get down easily and practice the faff.
Don't drop your phone.
Post edited at 12:34