There is "perfect"
- there is "good enough"
- there is "the learning curve"
- there also is "much as I don't want to, this really needs to be done over'
Sometimes it really is a machine that is "uncooperative" - also known as "POA" - piece of aggravation.
I have run into a couple of machines that - no matter how I fiddle with them - they do not sew decently.
There are also machines that do need a professional to get them going properly. As much as it pains me to spend money for maintenance and repair, being frustrated is more costly to my mental health.