I'm not sure about the 6 week thing. You may find you
have to express milk in order to relieve the pressure and avoid becoming engorged or worse. I expressed exclusively for 7 weeks, my supply is fine. As soon as Abby was old enough, we tried feeding. Since birth she has switched between breast and bottle with no problems. She even does it mid feed.
The NNICU were very clear, with all the babies they look after, there is no such thing as "nipple confusion." Today's teats are so easy for babies to use you shouldn't have any problems I'd say.
Surely the thing would be to try after a week or so and see how they get on. A baby wouldn't then refuse to go back on the breast. I'm not sure I'd want to leave it 6 weeks.
Think you should be proud I am not a very patient person

I read some of the threads on breastfeeding and watch the girls who reply in support with useful tips and encouragement I think its fab - hat off. Sometimes I kick myself silently that I didn't try but my lifestyle has a lot to do with it therefore wasn't better for me personally or my children (which I don't want to discuss).
You shouldn't beat yourself up about it. You're doing what works for you. Would it really be better for your baby to have you doing something which stressed you out? Why some women make such a fuss about other people's choices, I have no idea. Formula is not unsafe, it just isn't ideal.
I chose to feed mainly because of the palaver of preparing formula. That and the cost!!! I really don't like formula and the 2 times she had it in NNICU she was very sick. But - it is your choice and what business is that of mine or anyone elses?
Incidentally, nothing is entirely risk free. My sister persevered with breast feeding, had a really difficult time of it and ended up not enjoying her first months of motherhood to the point she was in real trouble. She stuck with it because of the kind of pressure and attitude expressed here. It turns out her son couldn't tolerate her milk. He was switched to formula and instantly became a different child. When talking about risks, it is important to know both sides!