Relatively easy, the fork will fit, however you will have to replace the steering stem, the OE one will do. The bottom clamp/yoke diameter is the same for WR and XT I.e. 30mm. The bottom bearing - the same, top bearing - use the OE one with the OE stem. You will need however to move towards one disc at the front and I would recommend going to 320 mm rotor to compensate for the lack of one disc ( the ten is on the heavy side). When looking into this direction I am not sure that the OE hub will do the job, most likely not. Better (if not the best) option will be to use WR front wheel and spacers. And last but not least - you will lose the steering lock. Of course you can modify to have a lock but still something to think about

Hope this helps

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that is how i feel about my XTR
Mods so far:
Hyperpro front springs; Hyperpro rear shock spring; modified air box; LED tail light; LED indicators + new relay; YZ pegs; Lucas aluminum bar; brisk spark plug; snorkel removed; DNA stage 1; second hand DynoJet O2 mod; crash bars; front and rear steel braided brake lines; soft EBC brake pads; mitas 07 tyres, 2in1 Metal Mule exhaust, Blocked AIS, tall OEM screen, OTR bash plate