First IUI, any advice?

Hi! We're doing our first IUI this month, am on CD1. Since we have no experience and had nobody to talk to who has been through this, we're a bit skeptical in terms of course of treatment before the IUI. My husband has low morphology and I have PCOS, however, I ovulate every month successfully. The first doc we've been to said I should start with letrozole for 5 days, have an ultrasound to check and then 5 days of injections with hormones (not sure what). The amount of letrozole she recommended was 20 mg per day. I am no doctor, it seems however to be a large dose for someone who a actually ovulates, so I wonder, has any of you been prescribed such a dose?