I am no fan of Estate agents but you asked for their service, they set their fee - you accept or decline. Only you can decide if the fee they charge offsets the value of your time to look around and find something suitable yourself.
It would be extortionate if getting a property can only be done through an Estate agent, but you are free to look around yourself. Ring around. Some specialise in rental property and may not charge anything or very little as they have a high turnover. Good luck with finding something suitable.