As above buy a tagger, also tagging at this time of year when the flys are about could be asking for trouble. You've got months yet, early winter for all those staying on your holding while you have to tag anything that leaves before then. The younger the lambs the more likely they could tear them out on fences, lambs have a tendency to push their heads through fences to feed on the adjacent pasture. I'll tag this years lambs in October/November and still be within the requirements. You may also see none or fewer torn ears by letting them grow on, also buy flexible tags and cut the loop so they are open. I use the Allfex Bublegum tags, which were recommended on here by someone their tagger costs £12 and is a sturdy piece of kit will last for years. The first time you tag can be quite stressful so I recommend having someone there to assist, they don't always oblige and stay still. Good luck.