ditto. It can be a waste of money, a headache, and a setback preventing you from finishing your project. It can cause huge problems.
Or, it can do what it is supposed to do.
All the employees at big box stores are hired for their ability to make you feel quietly confident. They all act as if you are able.
-- Anything else, and they don't get hired.
Whether they make you feel overconfident, is not a concern.
Whether they mislead you in judging yourself, is not a concern.
Whether they mislead you in judging what to take on, is not a concern.
Whether they give bad advice to you, is not a concern.
Whether they give bad advice technically, is not a concern.
So What is the attitude of the store management.
When you go to a small store, the employees think a lot about what it will be like when you come back later with a sour face and ask them to explain again what they told you.
David