Transfer box oil seal 300 tdi.

The oil seal on my transfer box is still leaking.Its been like that a couple of months now since I did oil change.Ive got the seal its just fitting the thing is awkward because its the rear one behind the hand brake drum.You have to take handbrake drum off to get at it.Just wondering wether to have a go myself or pay my mechanic mate to do it.Anyone done one?

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