Don't be hard on yourself, we were all learners. Fillets / Chamfers working - great.
The ah ah moment, constrain the arcs that need to be tangent, as Tangent at their connections.
So tracing a canvass - (presumes you have it calibrated and positioned)
I start by drawing / constraining all the straight lines in the item being created. (No fillets)
Followed by each and all arcs that can be made - if connected to a line / arc as a curved continuation, the Line tool with left button down will pull an arc off the connecting end point. (2 point arc)
Run around the outline and close it out with lines and arcs where appropriate.
In the case of two straight lines that are to be filleted, make the fillet in the Modelling Tool Box, not sketch fillet.
I use Fit Point Splines. I can usually get a 2 point spline closing a gap in the chain to behave by manipulation and constraining the spline (tangent) handles. Least amount of spline points the better.
(I can get the airfoils I trace with 4 points on top, and bottom of the shape.)
All rules are meant to be broken, so fine tune your workflows as you learn new tricks.
Fix yellow icons, when they happen, use the Undo tool. (Before saving the file)
Ask questions as to why they had appeared.
Might help...