I find them really easy and comfortable - always have. It's not good to keep them in for more than like 10 hours (depends on the type) or wear them every day of the week, but your optician will tell you that.
I've also slept in them, and none of this rolling to the back of my eyes business, certainly uncomfortable when you wake up though - really dries your eyes out (it's not blinking I think that dries them out)
My brother on the other hand, really couldn't stand to have anything near his eyes, couldn't bear to put them in... took him about an hour and a half to put them in and longer to take them out... never tried again. It depends on the person.
Your optician will talk through all this stuff with you though surely?
You get used to them. Though once in a while there's discomfort.
I've fallen asleep in my monthlies before, my eyes were quite sore in the morning. But after taking them out, my eyes quickly recovered.
Just remember to keep them clean.
3. How long can I leave them in for? If I get home drunk and fall asleep before taking them out am I in danger of damaging my eyes?
I wear monthlies, and i wear the cheapest ones you can get at specsavers. It depends on how much you are willing to pay. I'm not supposed to wear mine for longer than 10-12 hours (but sometimes I do, and it really isn't the end of the world - they just don't want you doing that regularly). If you pay more money you can get ones that are more comfortable and can be worn for up to 18 hours.
I have a number of times got back drunk and forgotten all about my contacts and left them in (and sometimes been sober but just totally forgotten i'd put them in that day and left them in!). Again, you shouldn't make a habit of this but its not a big deal. It will sting a bit when you take them out but as people have said, just make sure your eye has produced some tears to moisten it again before removing. I have woken up and been pottering around for an hour or so before even realising i never took mine out the night before!
The biggest thing you need to worry about when being drunk is if you have a different prescription on each eye and you take them out and put them back wrong into the lens holder then spend the next day switching them between eyes to work out which is left and which is right.