The major thing to do wrong is underexposure you need to meter carefully at box speed and develop at manufactures recommended time and temp.
An average meter is ok for average subjects 99% of time.
Proof on a sheet of paper all 12 or 36 should be ok at same paper exposure.
Go out on every Sunday am before church and shoot the whole roll proof before normal bed time.
Get a bulk loader and 400 foot can of Orwo 400 or 5222 Canonet or Olympus compact attend bring and buy with camera in wrist strap use sunny side /16 in manual.
All negs need to have silver in shadows... for zone 1 of prints.