Good grief! That seems to be a ridiculously long time for probate to go through.
My father died in late October and I was driving a car, purchased from his estate after probate had gone through, by the end of November.
I sold my Dad's house very easily too. I realised that it was on a busy road, with several other houses for sale nearby, meaning that anyone viewing the other houses would see a 'For Sale' sign on my Dad's one. So I ran up such a sign on white A4 paper on my computer and then took it to a copy shop to get it enlarged to A2 on fluorescent paper. I put one copy in the front window of the house and one in the side window. I got a potential buyer phone me very soon afterwards and we'd completed the sale in full just a few weeks later (with no estate agent to pay!)