How should I arrange LEGO to sell per pound?
Good question, and welcome to LEGO Answers! Assuming you are going to break up your collection but not sort it into sets, you will likely get more money for your collection if you sell it in smaller lots sorted by color. You can get a sense for what different colors are worth per pound by searching completed listings on eBay. 

However, I don't believe that the answer you cited is correct in most cases (including yours). The first item listed on the most popular answer is:


  
  Sell the collection as-is (with as much honest description as you can muster and great photos if you're selling on-line).
  


You don't just have random bricks. Since it sounds like you have many complete or nearly complete sets, you'd be losing that value if you break everything up an sell it in 2 pound lots.

Assuming that your collection is well kept, and you don't want to do the work to sort it, I'd recommend selling it as one large lot. List the sets that you have instructions for and indicate that you believe that they are 99% complete (e.g. you aren't aware of any missing pieces or minifigs, but some have probably wandered off over the years). There are definitely people out there that buy large lots like this and separate out and sell sets for a profit.

You'll want to take plenty of pictures. I'd spread things out and take as many detailed shots of the parts as you can. Experienced buyers will be able to tell pretty quickly how complete your collection is. Given that minifigs have much more value than regular parts, I'd also recommend taking photos of them in a way that allows them to all be identified.