I'm not an EA but I have worked with many as I regularly buy , sell and move
Most EA will be keen to come to value and market the property for you as it is just to get you on their books but really you need to consider the buyer before you do this
You mostly get two types of buyers ....
Type one who want a nice clean tidy functioning house - there can rarely see past the shit and need every room clearly defined
Type two who want a do it upper and expect to get a property that's needing work and pay accordingly ( as low as possible ) can usually see past the shit and are going to do a lot of alterations but expect to pay less for the property in the first place
To get best buck
Declutter to within an inch of its life , viewers cannot see past clutter and rooms look much much bigger with less in them , on right move photos the clutter will put off people wanting to view , you could store stuff that you really will need and use again but its expensive long term , as you declutter try to get shot of as much as you can , ( if I got a bit stuck I used to hold it in my hand and ask myself " do you want to move to a lovely new property or do you want to stay here with this gruesome item ?")
If you paint anything , just keep to white , if you use white paint it makes for clean and fresh , and also makes rooms look lighter brighter and bigger
Currently it's mid to late November so realistically you could do an awful lot to your house to make it look much better between now and the end of January , that gives you approx 10 weeks , ready to sell early spring and although people will still look over Christmas unless you are in a rush it would make sense to prepare properly - declutter , clean and update where you can ready for the the new year influx of buyers
Before you have an EA round to value know the rough value by looking for similar on right move ( ones that have sold within the last 6m to a year ) as at least 3 agents to value , choose EA's that sell similar property as yours in your area , ask locally for recommendations , then after valuations go with the one you feel you can work with best
Lots of folk here have given you good advice 😀