hi fred..its just the same as you would do normally, but you will be looking for a "full tile" wrap round in all four corners..
centre your main wall(overbath or window wall)
then as lance has said take one tile and walk it from your centre line to the corner and see what size of cut you will have(dont want a slither).
if you get slither cut then adjust centre line..(just take tile and mark the centre of the tile and start from centre of this, from your centre line on wall).
if cuts work out ok..then you will want to get your "datum" line now...
half the height of wall(floor to ceiling).
and again start from (datum)and again walk tile to top and again to floor to check what size of cuts you will have also check were tile will be above bath/shower tray, again no slither cuts,if any adjust the datum line(as above).
..then corner wrap round..
lets say in your corner you will have half tile cut, then you will have other half tile on other wall(full tile wrap round)
or if its 1/4 tile cut you will have,..then 3/4 tile on other wall.
you will want to take this around all "four" walls to check cuts in all "corners"..
then when your happy with all walls/cuts/wrap rounds...tile away mate..
also as lance has said when you are doing this with big tiles(600x300mm)
the tiles may have a slight bow in them so you will get shadowing on walls it will be very noticable mate with these tiles..when fixed and grouted to walls..
to check for bowing lay tiles on a flat surface next to each other an feel and look,you will see it..
if the tiles are this size (600x300mm) imo i wouldnt brickbond...