Do you already have your ears pierced? If not, you could actually get pierced straight to 8G, with 8G needles and jewelry. Just make sure you go to a professional piercer with lots of experienced; read up about some of the studios in your area and try to pick the best one.
If you do already have ear piercings, you can gradually stretch them to 8G, one size at a time. This will take several months and you do it yourself with tapers and jewelry; never go to a piercer to have your ears stretched. If you need more information about stretching we can explain it to you.
I'm Lindsay.
I have 1/2" lobes and 11 piercings: left helix x2, both conches, both nostrils, septum, navel, and VCH. My lobes are small but I know a lot about stretching and how to do it safely, so message me if you have any questions!