im not very experienced with WILDs, but i have experimented falling asleep consciously... your eyes going up in your head is normal (at least it is what happens to me). my eyes almost start to roll back in my head and that helps me see the pictures. dont worry about your eyes too much, they should stay closed if you focus on the images.

the swallowing thing gets me too. just concentrate on your breathing or keep thinking about lucid dreaming and it shouldn't become too much of a bother.

my main problem is when i start to see clear images i try to focus on them too hard then i lose them. it usually takes me around 10 mins or so before i start seeing images, not clear ones but they areimages nonetheless... could take longer or shorter for others though

basically just focus but dont focus too hard, if that makes sense