Oh, it's incredibly hard - you need to pay someone like me to come and do it...
Really, no it's not that bad.
Guide for untrained shearing in desperation: The tricky bit is controlling the sheep, which you need to do using your feet, legs, knees, body, maintaining firm contact and balance: pressure from 2 sides simultaneously helps. If they are still, you can shear at your leisure, but don't expect them to stay still for long. Holding them will tire you out and frustrate you. Controlling their head helps a lot (keep it off the ground if possible), and if you are holding a leg then keep it close to their body. A second pair of hands will make life easier. Don't try to tether like you do with alpacas.
In terms of actually cutting into the fleece, you need to find 'corners' or entry points where you can see skin - brisket up or down, front of rear leg into the flank, neck, face. Don't pull the wool up to see where you are cutting - that's when you stretch the skin and cut into it. Work from these points outwards - flip over once you have passed the spine.
Be confident, but respect your ignorance if you are unsure of the anatomy beneath the fleece. Areas to take plenty of time are around pizzles, teats, bums, eyes, ears, tail. If there are bad dags, consider having a pair of scissors to hand.
I'd say give hand shears a go - you won't be that much slower first time round, and they're cheaper by lots.
Don't worry if they look scruffy - go over them again, or just wait for it to grow out!