Mate!!

There's absolutely nothing worrying about stalling [pay closer attention when checking the aircraft

] at all! Tell your FI about it too, I mean if your nervous, it's gonna be way harder.
When I did it, I wasn't really expecting to plumet out of the sky some thousand feet and land with a
BBOOOMM or anything. No seriously, It's all very controlled, you'll only end up losing around 100 to 500 feet depending on how long you maintain it.
It's them spins you wanna look out for. I chickened out and just did insipient spins. Better than throwing up I say!!
Oh and when he says to pith the nose down..don't actully push it down, but relax on the pulling (of the yoke) and it'll go down gradually.
G'luck !!