a full sleeve is quite difficult to cover up, so it might affect you at job interviews or other situations in the future. You should see if there are any tattoo forums where people with full sleeves can give you advice or share their own experiences to help you make your decision
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I've also heard that a good idea is to wear temporary tattoos in that place for a few weeks or months so you have time to work out if you like having tattoos there or not
places like your back or upper arms are pretty good for tattoos because it's easy to hide it when you don't want other people to see it, and then you can wear a sleeveless shirt or backless dress/halter top when you want to show them off. I also know someone who has tattoos on her feet! But I think that's a really painful spot to get tattoos done