Precision work does take time to learn all the little tricks, but minus the gap, this looks good from here.  And look at all the money you saved doing it yourself, can't beat it!

When my wife insisted on a new kitchen, I listened up,.......................after 12yrs.  Besides, I owed the dogs back rent anyway.  When I retired, I bought myself a Grissly table saw, Dewalt planer, and a bunch of extra tools needed to do this kitchen, plus the material at a discount.  I saved a ton of cash and my wife and I did the build and install.

And remember, YT is your friend!