First IUI Scheduled Tomorrow. Any Tips/Advice?

I'm 30, DH 28, TTC 3 years for #1 and just scheduled IUI tomorrow.  We took Letrozole this cycle (for the first time) and have received a positive on the opk, so we're off to the fertility Dr in the AM. We haven't told any friends or family, just to avoid the awkward questions if things don't work out, so my question to all of you is do you have any tips or advice to share with us for greater success on our first round of IUI?  Anything at all from those who have done it would be great!  Thanks!