You have summarized my predicament very succinctly! Do you know anyone who is knowledgeable and have time to do this?
Sorry, I'm in Wash. and don't know anyone in Portland area. Hopefully someone reading this thread will be able to get something going for or with you. Selling stuff piecemeal brings more money, takes more time. Sold in one lot, you will realize the least money but the most quickly. Knowledge of what is there is key. The level of integrity of a facilitator for this is very important. More that one evaluation would be a blessing.