I don't think I found any of the elements easy, all the way through the skate uk programme. In my case, I definitely have no natural ability, just determination to give it my best shot.
The warm up issue is always a problem, it even occurs at competition level, where skaters are expected to step onto the ice and do a programme in front of judges and spectators with only a few seconds warm up. It does get easier with more practice, my advice is warm up as much as possible OFF ICE so you are only concentrating on the balance issue when you step onto the ice.
Skulling is actually easier than stroking (normal skating), since both feet remain in contact with the ice, so is presented first to get the skater used to moving backwards. Again, lots of practice is the answer here, I used public ice. I used to supplement each 30 min lesson with about 3 hours minimum of practice each week. Skating backwards requires lifting each foot, and the glide requires speed, so more competence is expected - hence level 4.
As for having a moan, well that is where these forums are great isnt it ! As you can see, nobody minds, in fact it reminds me how much I struggled during those earlier levels.
Hang in there, and good luck!
Derek