Of all the Primitives, I find the Shetlands the easiest to handle. They are very readily tamed to a bucket, being rather a greedy breed. It's quite simple to train sheep to be fed inside a pen, which you originally leave open, then when they are used to that, you occasionally close it when they are in, do nothing to them, then let them out. When you actually want to work with them, just keep the pen closed. They will remember next time and be wary, but a few more feeds with no handling will get them used to the system.
Shetlands can be used to tame other breeds such as Hebs, but if you have a freaky Soay she will remain freaky and lead the getaway.
As with all sheep, their ease of handling depends on how you handle them. Lots of running and shouting and your sheep will also run and shout; keep calm and act calmly and they will follow suit.