Well apart from the old adhesive strips coming to pieces, requiring a bit of delicately-applied heat and brute force leverage (with my library card), that went OK. It's got a new battery and it booted up with no errors.
Just changed battery on a Sony experia, that wasn't too bad, just had to take out 6 torix screws and prise the 2 halves apart... (had to find a youtube video first though!)
Sounds OK - I had to deal with 5 different types of screw, 2 strips of hard-to-budge adhesive, a cable that you could have snapped if you opened the two halves without knowing it was there, two connector covers and about 5 connectors to disconnect.