Layout, transferring layout, and execution of the rabbets laid out is most of the skill. Work with the profiled planes is dictated by this layout.
Transferred Layout. You can see that the line of the ogee is not parallel to the tips of the rabbets that guide the round. I made my rabbet slightly wider and not as deep. You can see below that I removed the vertical pencil line and left the horizontal.
Note that the tips of the rabbets for the lower portion to be profiled with the round are now parallel to the profile of the ogee. (Roughed out on a table saw, touched up with a rabbet plane.)
Mistakes happen. Recognizing mistakes and correcting them early is crucial. Check your progress.
We have discussed how hollows and rounds are difficult to steer and that steering should be done with the rabbet plane. But what do you do when a chamfer is wrong?
Note that I am intentionally laying out the chamfer for the hollow to follow out of line with the profile of the ogee.
The profile left by the hollow is out of line with intentions.
I took my rabbet out and reestablished a chamfer that is much steeper and more accurate.
If your rabbets for the lower portion are out of line, a similar correction can be made. It's important to check you progress and recognize errors early. If you don't adjust for mistakes early you will end up pressing the the plane against the profile while trying to cut with only a portion of the iron--a difficult and inaccurate process.
As your accuracy increases your scraping at the end decreases.