Fitted one of these myself and if I can do it, anyone can. Took the best part of an afternoon, but only because I had to have lots of cups of tea to summon up the courage to attack the door card with the drill.
Measure twice, cut once ... I found it was a two-person job, second pewrson for holding things, checking measurements and just for moral support!
Actually there is a fair bit of tolerance and it doesn't matter if you are a few mm out.
End result is very handy and probably the best mod to our standard Freelander. I've got a Freelander Commercial rear window guard but no instructions or fittings, so if anyone has fitted one of those, I would be interested to know how.
Cheers
Blippie