The day before you intend to clean is the day to do a little prep.
Find a rental location and get a coupon-
and enter your zip code for a coupon and near by rental locations. (You don't have to enter your email addy, unless you really
like "exciting" offers on carpet cleaning products.)
Turn your water heater up-
This step is optional, but recommended. Hotter water will give you a better clean. If you have the ability to do so, turn your water heater up to hot. This will increase the water temperature in the whole house, so be careful and always test the water temperature before bathing, etc. This is done, often, by turning a large dial on the front of your water heater, at the foot of the tank. You may also want to mark the current setting.
Make a filler-upper-
Yes, filler-upper is a technical term. A filler-upper is nothing more than two lengths of PVC connected by and elbow, with another elbow on the end (see photo 3). It is not required, but sure makes filling the machine from the sink much easier. No need to glue the parts together, either. If you are on this website, I imagine you have some laying around somewhere... go scrounge it up.