Not everyone on this site does the one-sided thing. Perhaps in your case it's not right for you and your baby.
but then if i offer the 2nd side she is keen to feed off that side (she quickly becomes alert to feed).
I would say that if she still seems to want the second side then do offer it - You wouldn't want to develop her snacking.
Plenty of people do double-sided feeding from the beginning (even with big boobs) and don't even think anything different is an option. I really wouldn't worry whether you can manage single-sided or not. Just make sure she is choosing to come off the first side and/or has had a really good first side feed so she gets the hindmilk. Then start with the second side
first the next time.
Tracy says use your common sense and mummy instincts. In this case it sounds as though double-sied feeding is right for you.
Newborns
usually feed 8-12 times in 24 hours. If she's happily going 3 hours then that's great but don't feel you have to make it to 3 hours if she seems hungry before then. Many of us start on 2-2.5 hours. The more you feed in this early stage the more milk you will produce. The first few weeks are really important in establishing your milk supply. I wouldn't worry about mucking anything up. It can be fixed. Feed frequently and talk to a helpline if you have concerns - numbers are on the FAQ page.