I went through the exact same thing after being my mother's caregiver. The bulk of her small estate was in the house. I was in no state to get it ready, so I moved out and went back to work. He did all the work in terms of getting it cleaned out and doing some minor upgrades that made it show much better. We agreed that I (and my niece, the other heir) would pay him for his work, and we split expenses on the things that needed to be purchased, like a new stove. When he finished I asked him how much he wanted for his labor and he said $3K. Oddly enough, I was thinking the same amount.
I have an old friend who is a real estate agent and he gave us lots of advice. He ran the comps for the neighborhood, but he also walked through all the houses that were for sale at the time in the area. It was built in 1965 and while it didn't have its original avocado green carpet, it did look pretty dated. We did some things he suggested and DIDN'T do the things he said would be a waste of money. He suggested a listing price with the caveat that we could ask a little more, but it would be a slower sell. Since the proceeds were being divided by 3, we went with the lower price. It sold in 3 weeks!
If you can't get your siblings to get the house ready (after all, you did your time as your mothers caregiver) then hire someone to do an estate sale. They will take a percentage of the proceeds. Check with churches that have thrift shops in your area. They often take care of estates sales with the understanding that whatever is left over, they can sell in their thrift shop.
Do you have any friends or other family members (like cousins) who can talk to your siblings and tell them to get with the program? You cannot do this all by yourself.
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