I usually put in a new thrust bearing when replacing a clutch. For the extra it costs, it's an awful lot of hassle to have to take the gearbox out again if the bearing goes.
Much the same consumption as mine then. TBH I have also heard that 1ltr per 1K is the maximum permitted and this is the reason I have not yet pressed the issue it with the dealer.
I think I know what you mean. Mine normally starts no problem, but I have experienced similar to what you describe on a handful of occasions. I don't think it's anything to worry about though.
It is a piece of cake. The fitting instructions that come with them are quite good as well.
Essentially, you can fit the fronts by puting the steering on full lock, but you will need to remove the rear wheels for the back ones.