A good tip to assess an estate agent is to see if you can find a house they've got for sale at present that's similar to yours, then call them to enquire about the house and see how skilled they are at selling it to you.
Things to look out for; do they make an effort to scope out if you're a serious buyer ; are they flexible in terms of the times they're willing to show you the property etc.
Also, when you bring the estate agent to value your house, ask them if they have any advice on how to improve its saleability. Based on my experience the good estate agents will give constructive and specific advice on what might make a difference. Put another way, if they quote the usual cliches "declutter; keep it nice and tidy" ; it could mean they've been on auto pilot during the viewing; rather than trying to spot the unique selling points (or weaknesses!) of your house.
In summary, there's very little to be gained by hiring an estate agent who's cheaper but who's going to have your property on their books for the next however many months. Go for the agent who based on your assessment is more likely to sell your house quickly and if that's the person who's charging .75% great, but if its the one with the higher fee it could pay for itself.
Best of luck with it.