Done a few of 'em. Only painful part is the spring tension on disassembly/reassembly. Not ~bad~ per-se but if you don't expect it, it'll be a face-full of surprise IYSWIM. /bcforum/images/%%GRAEMLIN_URL%%/wink.gif
Have you got a workshop manual for the car? If not, I'd say find one, mebbe e-bay or ask around the nearest Jag owner's club(s). It has an extensive explanation of the assembly process. If you get 'stuck' post the problem and we'll try working thru it. I've a factory book here (on the 6-7/8" "pot") and may be able to scan some of it.
EDIT: You may need to PM me to get my attention: I rarely stick my nose in the Jag forum. /bcforum/images/%%GRAEMLIN_URL%%/wink.gif