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grumpygrouter
Nice tip Strongboes.As already advised i would use a rapid set flexible.
A tip for you on levelling the floor, if using a leveling compound as I would imagine you would be, then it is possible to use a straight edge to pull off the floor perfectly level and flat, basically as soon as you can walk on it without you marking it, but before it is set.
Use the longest straight edge you can get in the room, i have one 2.4 metres long for this. Obviously use in conjunction with your level.
I would say go for the job! The tiles are only 400*400 so shouldn't be too hard. I recently did a job with 600*600 and it looked fab down. Best of luck!
Grumpy