Note, the question isn't searching for a home, but buying a home. If you do the leg work on your own, identify what you're looking for and find it, then what are the downsides of not making the purchase with the assistance of a real estate agent for you as a buyer?
For example, I know there's a lot of paperwork involved and figure a lawyer can tackle that, but how much money does that generally save (or does it not save $ at all to cut the real estate agent out of that)? I'm also aware the real estate agent can help with negotiations and working with a house inspector. Let's say I am a confident negotiator, and have a reliable home inspector in mind to work with - is there something I'm missing out on by buying without a real estate agent? Though real estate agents may be great negotiators I expect even a good buyer's agent has some incentive for the sale price to be higher rather than lower, as their commission is greater with higher sales price.
Does the answer change depending on whether the seller is using an agent or not? I'd think the answer wouldn't change and the positives and negatives would be the same when it comes to using a buyer's agent.