We had/have both a tiny potty and the seat. The big toilet scared DD1. After she was more than 50% potty trained, we started using the seat more. By this time, she knew how to push her foot stool over to the toilet and get sat down, and she had for the most part gotten over her fear of the toilet.
Our potty chair from DD1. It was pretty easy to clean the #1s and 2s.
Our padded Dora toilet seat