Solos? modelman... you're doing great!
Nerves MUST be the norm at this stage, only natural. When I reach your standard I'm sure I'll have nerves too. I too am always slightly nervous in flight, esp. when I'm not doing things properly. I don't often smile up there as I'm concentrating too much and striving to do everything right, but I always have a ball, esp. on circuits... (so much fun!) Tips to relax? Despite taking my lessons seriously and being harsh with myself for making mistakes, I do try to share a joke with the FI, often in the form of self-mockery when mistakes appear. Having a quick laugh makes me relax more, which seems to have the knock-on effect of making my performance better. FI is quite easy-going but I think as he knows I try to make an effort, he appears not to have a problem with my comments! Not great advice but works for me.
Sorry, thread creep here, but a quick aside...
Ian, Bumpfish? I only do BUMFH...
Brakes - Check & Off, heels on floor
Undercarriage - Down
Mixture - Rich
Fuel - On and sufficient
Harnesses & Hatches - Secure
... followed by RAT checks soon after...
Runway - Spacing
Altitude - Correct
Traffic - Monitored
What are the rest you are made to learn? Just curious.