If there is allready flourite in the tank , which it sounds like, I wouldnt even remove it. Run the canister to get it ripe like you said for a couple weeks, get a large tote like Desolas said and put the fish , plants etc. in it when you are ready, drain only 1/3rd of the tank water and just push all the old flourite off to the side enough to get the plate out , then suck all the murky water that is stirred up out of the tank and refill. If it is still really murky do another quick water change then rinse your new flourite layer well and cap off the old flourite and you are in business. I wouldnt get all crazy removing the old stuff and rinsing it, all that mulm will be good for the new tank. Why waste a good thing ?
The whole process would take only a few hours tops.