I don't think Sky's Rim will be moved. You just keep trying. Set home every once in a while if you find it hard. This is supposed to be in Game Discussion, I believe.
There's also a little "shortcut" somewhere along the many platforms of Ascension Island. I could give you a quick guide, however:
1. Set home. Used by millions, 100% effective, and already mentioned. -.- Got it?
2. When you get to a "fork in the path" (there's only one) you take the left route. It's the right way.
3. Once you're more comfortable with jumping on those platforms, you could take it to the next level by jumping 3+, setting your home there, 3+, etc. until you're positive you've got the jumping thing down.
4. Shortcut time! At a certain point, there's a part where you've got to go DOWNWARDS instead of up, which catches lots new players. You can avoid it with the shortcut. To do this, you find a certain spot that's higher than the one that leads up (after the downwards). Make sure you don't have wings; you press the "E" key once and boom! You're over there, and you continue onwards; easy!
5. Once you get to the donuts (yay, donuts!) you MUST set home on EVERY. SINGLE. RING. Super-skilled jumpers can go without setting home at any time, but you might not be there yet.
6. Extreme patience. It took me hours to get to Sky's Rim. (You can fly in Sky's Rim, so don't freak out.)