chuck a book under the front wheel otherwise you'll feel like you're going slightly downhill all the time
I used a house brick with an indent in it and "toe strapped" it to the front wheel. I bought a turbo trainer specific tyre and fitted it to a cheap wheel with a close 12-21 7 speed cassette. And a fan is essential.
I used an old yellow pages at first but have upgraded to an off cut of 6" x 3" to raise the front wheel. I went for a Tacx magnetic, can't fault it.
I am not as fit as I used to be (read that as desparately out of shape) I can share the following recommendations/observations are from someone who doesn't have a decent base fitness, which may not be your situation:
Get a heart rate monitor (£10 Lloyds Pharmacy), not just for the obvious reason of seeing your heart beat, but as one of the many distraction techniques you will need to employ to get your mind of the fact your legs are on fire
Fan is essential otherwise you will think you are leaking. As I use mine indoors I put a plastic sheet under the bike that can be washed off regularly.
Doing reps are a good way to make some time pass - after 20 minutes to be fully warmed up I do 30 seconds at near max / 2.5 mins recovery, for about 6 reps. the recovery time flies by.
You need music or TV to distract you. Music needs to be the right BPM or it gets irritating when the beat doesn't match your cadence.
TV is good, bbc iplayer is perfect, I like the F1 on a sunday for a session that's longer than an hour without it feeling like time has stopped. I have stand for my lap top in front of the bike.
Always make sure you have enough hydration to hand - running out of water has sometimes been a justified reason to end the pain.
Is your stem really perfectly aligned with your front wheel?