I'm gonna try that splinter/syringe method for sure!
When working with sheep don't hurry, things always go smoother if you go slower, no matter what the job (moving, drenching, lambing, everything).
Spend time sitting and watching your sheep. Sheep are clever, watch and understand what their behaviour is telling you.
Go with your gut feeling, if you think something is wrong is probably is, so act straight away, don't leave it until tomorrow. Even if it turns out not to be a problem you will sleep better knowing that. (the exception is if you are a real newbie in which case you think everything is wrong, when it totally isn't, lol)
Don't leave baler twine in heaps on the floor/in a bag - cut off the knots and hang it up somewhere - it only takes a second (I hang a safety knife next to where I hang my twine, together with a bucket for the knots). You will be thankful of easy access, untangled twine when you need some in an emergency!
You can never have enough buckets.
Teach your sheep to come when you call (and/or shake a bucket of food), even if you have a sheepdog.
Re-usable syringes (used for drenching) can get stiff and dry after a while. To keep them moving, just unscrew the cap that holds the plunger on, pull it out and coat it in cooking oil - do this every other time you clean it.