My entire collection is slabbed so I need to buy the coin that is like all the others in a slab that matches the other 23 coins I have to complete my set.
Don’t drink Kool-Aid and learn how to grade yourself instead of relying on others. Don’t let great opportunities pass you by. There are far fewer coins that I regret buying than ones that I don’t. Missed opportunity is usually worse than taking action.
A great price should never be the only reason you buy a coin. I personally don't make that mistake, but I do continue to struggle with this concept: Buying a "Great coin at a Fair price" will give you so much more long term enjoyment than buying a "Fair coin at a Great price".
This pertains to Ancient and World coins much more than US modern, but to add to the list of things NEVER to do in this hobby: Fall into a habit of asking others to give you attributions for your coins, rather than allowing yourself to experience the fun and education of doing so yourself.