Hi, MAMA89, I'm in a similar situation to you right now. DD is 7 weeks. Was exclusively BF up until Friday, when I expressed for the first time. Main reasons for expressing are that my hubby wants to feed DD, like you, I need some time to my self and also, I have a wedding to go to next week - couldnt find a nice nursing dress so hope to take a couple of expressed bottles as emergency back ups for times when I cant slip away to feed.
Because I expressed at night time, I only managed to express 2 oz the first time. I gave this to DD during the night, as well as offering her the breast. Like you, I was so anxious in case she refused breast after but she took both with no problems. I put the bottle up to her lips and she just sucked it in and started drinking! We were delighted. Gave her another expressed bottle yesterday and, again she took this with no problems. She has gone back to the breast fine. I am using Avent bottles, no. 1, which is the slowest flow. I have read that your best to use the slowest flow as it is closest to what baby will experience breastfeeding i.e she will have to work a bit for the milk. As for her being confused, she did not seem to be and was pretty relaxed when she was being bottle fed.
I know that I am prob quite lucky as some babies refuse bottles or dont go back to the breast.
In the morning, I have been able to express 4-5oz in half an hour. Much harder at night, took me 1.5 hours to express the same amount tonight, so I'll stick to the mornings from now on! Expressing also seems to be faster if your baby is feeding at the same time from the other breast as you will get "let down". Its a bit awkward to do, I needed my DH's help to get comfy.