You are certainly NOT a fool for asking questions - I am recently diagnosed (3 weeks ago) and I have mountains of questions - I don't always want the answers though!
Please don't worry about the pre-surgery assessment - for me it was like an MOT - blood pressure weight height blood tests. etc,
I am going for a lymph node procedure involving dye tomorrow (Friday) then have my bi-lateral mastectomy on Saturday.
I'll report back any tips about the lymph node procedure after I've had it - it appears to be straightforward. Do you have a breast care nurse assigned to you?
Please take care.