ive bought a widearch cossie kit for my mk5 cab, but how hard is it to bond on myself? or is it a job that should be left to the pros?

im not bad when it comes to fitting panels etc but ive never tried bonding anything on and i would be found hanging from the nearest tree if i did it myself, paid a fortune for a paintjob and then it fell off!!

what exactly do i need to make the job a good'un? or is there anyone up my way confident at the job that would lend a hand?

cheers