use post it notes to mask off your corners going from outside corner to inside corner. Use the Wheel guide to ensure you are getting a straight image, wheel the two shorter sides.
Here is what it will look like:
Mask off the opposite corners, wheel the long sides.
Here is your final look
Note: if your wheel doesn't have symmetrical edges, be mindful that you are wheeling each edge in the same manner. I always had the left side of my wheel closest to the inside part of the frame.
Here is my final card
I made an impressionistic like painting of the image from Upsy Daisy by stamping it onto watercolor paper and going over it with an aquapainter and more ink. I also added so saffon around the flowers. When I was all done I wiped the wet brush over the whole image once last time. The frame is mounted up on dimensionals for depth. The birdie is a Sizzlit die from the SU mini catalog.
I like how soothing it turned out.
I hope you will give this a try, it isn't hard, I promise!