We have recently cut up two of our hoggets ourselves, they killed out at 19 (pure Shetland wether) and 22kgs (3/4 shetland and 1/4 txl, but he was areally poor doer and entire) each. We took them in early November, no tup taints as far as I can tell. Fantastic taste though!!!!
We found a website, I think it was on the Guardian website somewhere, it showed very good pictures of the actual steps in cutting. We only used a good saw and very sharp knives. It took about three hours per carcass, with OH doing the big cuts, and I did the bagging up, cutting into chunks for stews (shoulder) and also the mincing. We had to do this, as we didn't think our butcher did a good job on the last batch of pigs and charged much more than we expected....
So if you bring them in now, let them hang in the abattoir for as long as they do it (ours is free for up to a week), then take the home and do it yourself!
But then you cannot sell any of the meat!