@Hannah Wilkinson Not sure if anyone touched on this yet, I skimmed above but aside from what everyone else said about the benefits of working with a buyer's agent, there are also pitfalls to working with the seller's agent without representation of your own.
There are different levels of representation and different levels of service that can be provided based on those.
Long story short, a buyer's agent always has your best interest in mind. They can provide you advice and help you negotiate.
Working with a dual agent, where you sign an agency agreement with the seller's agent, that agent will only be able to provide you with material facts about the property and pass communication between you and the seller. They cannot help you negotiate or advise on how to structure your offer or what things to ask for (maybe include appliances, etc.)
Working with the seller's agent as a Customer (as opposed to a Client in the two scenarios above), you are not represented. Any information you share with the seller's agent about your motivation, negotiating position, etc, that agent has the duty to pass that along to their client, the seller.
The difference between a Client and a Customer is very important and one of the most misunderstood concepts.