These can be a bit daunting if your knife skills aren’t great. The key is practice really and a sharp knife.
Wash first. Keep your knife hand dry. Cut off the top and bottom. Then cut the skin as close as you can manage.
Serve, if you want to save some for smoothies, freeze a bit in a baggie. You can also put a piece of foil onto your grill and roast them while your food is cooking. They caramilize well and are great warm.