Experience coupled with some instruction will build confidence before going into 'auto' mode.
Maybe too much confidence on my part....
Last Friday I went to do some shooting with a friend at a local indoor range. The very first round in my 1873 Winchester was a squib. The bullet was stuck in the barrel just enough so the next round would not chamber. I removed the bullet and fired the rest of the rounds with no problems.
When I first started to charge on press I installed a light on my press so the powder charge would be visible and easy to see. I thought I had trained myself to look in each case. In spite of this I still ended up letting let a round go through without a powder charge. I periodically weigh a charge and probably forgot to recharge the case. Regardless of the reason, this should not happen. This was a big warning to me. I will still charge on press but will re-examine my procedures to insure this does not happen again.