I find hand shearing up to about 6 sheep a pleasure, from 6-12 ok and over 12 a bit tough. On the other hand its very good in poor weather as you aren't shaving right to the skin like machine shearing so the sheep appreciate that, and the shears are £12 ish compared with several hundred for electric ones or £40 upwards for a shearer.
I have the two ends of the spectrum. The Shetlands, ESP the white and moorits, I make more from the wool board than they cost to pay the shearer. But the Herdwicks I've recently taken on,,,,well, think i may be using theirs for hanging baskets or protecting brassicas from slugs, or selling privately as thei rate for them is a tenth of that per kilo than for the Shetlands!