Keb, when I administered my father's estate I knew there was a sibling who would argue about everything, so all of my work was documented, and with the house contents I had an appraiser come in (recommended I don't remember how, but he was a local dealer and had booths at antique malls, etc.) That made it a lot easier in the long run. The income taxes had to go to a local accountant because of a bank account that I had inherited with a CD that matured before he died, and the tax on income that needed to come out of the estate. There were also a couple of IRA's that had direct inheritors to be noted and excluded from the total.

It all took over a year, maybe as long as 18 months (I'm not pulling out records to confirm my estimates). I'm hoping it's easier for you than it was for me. I did all of the work myself once (with a set of state-specific probate documents) then had to turn it over to an attorney to do the exact same thing I had already done because of the fighting sibling. Before it was over that attorney had a restraining order against the sibling, so it wasn't just me he was mad at. (And a more personal note - at the end of this I was diagnosed with a form of endometrial cancer that I am still convinced was brought on by the stress caused by that particular sibling.)

Here's hoping you're dealing with functioning adults through the process.