We bought a pair of B & B spring bow type shears. Tried them in the shop and found the double spring bow were easier to use as they required less pressure to close. Take some paper with you to check they cut properly.
My it's slow work. 20 minutes and both my patience and Lauren's (the ewe) was spent. Ended up shearing her a quarter at a time, so for 3 days she did look a mess. Next year she was taken to a local farm at shearing time.