HomeDepot or Lowes? Often times if you are even aware the topic exists you’ll be a step ahead of 75-80% of the staff.
If you go to a proper plumbing or electrical supply place, they can often point out that the video you’re watching isn’t doing work compliant to the local electrical code and you need to do extra step Y or you’ll fail inspection, or that the whole operation is not going to work because the length of your run is too long for the size of pipe/gauge of wire you’re using (which the video never even talks about), and you need to upsize or use a different technique.
Local shops without expertise are definitely not going to do well. Someone with experience and expertise who sells what you need and actually has it in stock? Super Super valuable.