1) Most people suck at something the first time they do it. First-year teachers are often bad - would you pull your kid from public school because his teacher just started? Most parents wouldn't apply the same standard to the school that they do to themselves. https://twitter.com/CatholicKanger1/status/1352827034901180416

2) Teaching is a skill like any other, you get better at it with practice. The investment will yield returns if you stick with it long enough.
Additionally, most teacher preparation programs do not improve teaching skills, but rather focus on current dogma.

3) Even if you are bad at teaching compared to an experienced classroom teacher, you are working 1-on-1, not 35-on-1, so you gain a huge amount of effectiveness.

4) Teaching is more about management than communication skills in the classroom. As a homeschool parent, you don't have to keep 35 kids quiet. You have to deal with a handful at most.
Additionally, pre-made curriculum does most of the hard work.

5) You also get more done in less time due to efficiency gain at the individual level. Probably 50% of the day is wasted in a traditional school due to transitions and the diversity of learners (in other words, some kids finish early and do nothing, some don't finish at all)

That means more time with your kids doing enrichment - music, sports, farming, art, cooking whatever. Also, play! That's learning, too.

Just think back to when you were in school. Were all of your teachers so great your mom couldn't have done better, or were there some that were so bad you forgot what you already knew?
Just because somebody has a job doesn't mean they care to be good at it.