I have done both hiring and now because I couldn't find one at the right time, I bought one and a companion wether last year. Hiring is the cheaper option ( about £10 per ewe is the going rate around here ) first time round, but providing you've got somewhere to put him when he's not working, it's obviously cheaper in the long run to buy. Another benefit of hiring is that you can experiment with different breeds if you want to. If you purchase for the long term, then obviously you won't be able to keep any of his lambs for breeding.