Hi,
This is all foreign and new and just like you wouldn't rush and make a major purchase or decision without researching and thinking it through your treatment options should be the same. Don't feel like you have to get in and decide on the day. One of the few things I remember from that first appointment with the breast surgeon was her telling me that in the USA they average 6-7 weeks from diagnosis to surgery and yet their outcomes are virtually the same so you have time. There are positives and negatives to every decision so if you feel like you need to take a couple of days to research a little more (and yes the Guide to Early Breast Cancer is awesome but so are the real life experiences women write about on here) weigh things up and feel comfortable with your decision then speak up and ask for some time.
Good luck, Jen