Right iv almost had my 20vt now for year and no major issues have come up (touches wood)

so i think its time for a remap

what worry's me though is that my car has done 108k

, but it has full history and serviced every year. is this something to think about, millage?
what things should i expect to go wrong from a remap 1st? and how likely are theses things likely to go?
I think the car is running original turbo and clutch.
Ant