I've just replaced my battery on a 2000 1150GS. I don't have QD fittings either.
After reading the service manual thingy it seemed really easy to do - basically what longdog says - but mine didn't want to play that way.
OK I says, I'll read the Clymer - they seem to think that all sorts of bits need to be ondone / removed. Thought there must be an easier way - don't panic, slow down, have a look.
My method (it helps to have the tank as empty as possible)
1) Remove r/h black panel
2) Unbolt tank (single bolt, rear right)
3) Lift tank at rear, pull backwards, lift & twist to the right so tank is on it's side
4) Get friend to change battery over (not forgetting negative off first and on last) whilst you hold tank (depending how strong you are determines how full the tank is

)
5) Relace tank (taking care not to trap anything), replace bolt and replace black panel
6) MAKE SURE THAT STUPID THROTTLE CABLE IS PROPERLY SEATED ON THE RIGHT-HAND SIDE
7) Turn on ignition, fully open and close throttle twice, then press starter
(There is always the possibility of role reversal for 4) if you think your friend is better suited to holding it for you whilst you do the technical stuff

)