Here a link to PVC Repair
from Riverconnection. It suggests tears > 1 inch should have an inside patch.
It seems like it’d be better to first do the inside, then the outside patch. This will take longer, but you’ll get better results.
If you glue both sides until tacky, you will not be able to apply pressure unless you put both patches on simultaneously. Also, you can get some practice with the inside patch, then use your perfected technique on the patch showing.
You may be able to remove the valve to get an extra couple of fingers on the inside of the tube to manipulate the patch and glue into place.
Take your time, and make sure there’s plenty of ventilation.