It is very difficult. If you can't make it, you can still progress with the game. It's only a page for your Relto...not something you need to keep going. If you're not obsessed with furnishing your Relto...give it up and go back later. You can always link to Eder again.
I found it easiest to go up on the far right side of the tunnel facing the rock. Run and jump at the whiter part of the rock, and then WALK and jump to the top. You can't stop moving but let go of the shift button (turn off Caps Lock if it's on) so you are walking before you try to jump to the top of the rock. Once you're on top of the rock and stable...turn slowly until you're facing between the funny plants before you run and jump. Hope this helps!
Oh, and if you didn't know, you can take some fireflies into Relto with you! It sure looks pretty!