What problems did you find in executing perspective drawings?
Often the angles I assumed to be correct where not of a sever enough . I must trust the eye and not the brain! Particularly with one point perspective, looking down a tunnel effect, I found it challenging to get the for shortened objects (the rug) right. It is complicated looking both bellow the horizon line and then above it.
Make notes on the merits of using or not using a ruler to guide you.
Using a ruler means lines are more straight and angles are accurate. however drawing can be in danger of looking clinical like a blue print rather than art drawing.
Not using a ruler gives a feel of the artist hand but can lead to wonky lines and warped perspective.
I think a combination of the two is favourable. Perhaps to faintly draw in some guide perspective lines and then go free hand with the actual drawing may be best. Of course with a large drawing it will be harder to keep lines straight drawing free hand. But may improve perspective as you are more likely to have it on a easel and be able to step back to examine.