Mike, there is ample space if you take off the manifold heat shield. I find it easiest to take the bottom nut off by hooking your arm under the coolant pipes from the expansion bottle, but then again im a tiny guy and my hand fits almost anywhere.
Gaz, with the heat wrap wear gloves! and soak the wrap in a bucket of water before you start. The glass fibre shards stick in your skin and itch like hell if you dont. And im assuming the manifold is off, or your life will be hard!
Overlap each wrap by 1/2" or 50% of the wrap width, which ever is smaller, make sure its even all the way round or youll get hot spots. When done spray it with a silicone based wrap spray which will extend the life of it by about 50%. And when you turn the engine on itll SMOKE!!!! (like your engine bay is on fire) like hell, itll do it till cured which can be quite a while.
If you know this already, soz!