I recently did a wiper seal/foam ring replacement and lower service myself on my ~18 month old fox 32's
For no other reason than the service interval was quite a long way past....
wasnt anywhere near the recomended amount of oil in the lowers as Fox recomend (i.e. virtually none) feel "better" for it and not a difficult job really.
after this I have decided I will fall on the side of, do a lower oil change/service, open the rear can and visual check/clean myself every 6 months ish and not worry about sending away for a "proper" job and the money I save can go towards new forks/shocks as probably the cheapest way.
i.e. keep an eye out for deals (also picked up the CRC £130 rp23 bv deal so my old rp2 is now effectivley a spare as nothing was wrong with it)