Easy job (basically follow Adam's How To for cutting down the cam chest cover), drain the engine oil, rotate the engine (follow ph's how to), rotate the crank to TDC compression on the rear cylinder, whip the rear rocker box off, rotate the engine to TDC compression on the rear cylinder, remove the cam position sensor, remove the cam chest cover, put bike in gear, undo the nut holding the cam pinion gear and oil pump gear (a good idea to make sure the woodruff key is at 12 o'clock), then swap the gears over, put the nut back on with some threadlock and reassemble with new gaskets (and a new seal for the CPS).
Worth doing, there has been at least one guy on here (one with an XB9R) who wrecked his engine when his let go.
There are some theories that the base of the oil pump should be machined to bring the gear centre lines in line with each other, however bear in mind that there is some free play in the oil pump drive shaft and this (IIRC) is lifted when being driven, so it ain't that far off (and is used on Sportsters, XBs and tubers alike).
The 06 and beyond Buell gear is phosphur bronze,
Lucky Hands does an alternative which is appears to be sintered and oozes quality compared to the rough finished machined Buell item and is said to be unbreakable.
I will be fitting my Lucky Hands gear this weekend - thanks to my best (on-line) friend.