First time being the bull, very nervous, and could use some advice

Basically, I (24M) am exploring my fantasies and basically left an offer for a sensual foot massage on cl.

A couple (early 40s), male and female responded and basically the husband wants me to sensually massage his wife while he watches. The plan currently is we will meet at a hotel, grab a couple of drinks, vibe out with each other, before heading up to the room. They seem nice over text, and I am gonna FaceTime them to meet them a little more personally.

It sounds very hot and I’m excited but I’m very nervous. I get anxious with sex normally and I’ve never done it with someone older, someone I’ve met online, and while someone is watching.

I don’t want to get performance anxiety or anything, so is there any advice I could get? Thanks!