Do you need a meter? NO! You do not need a meter.
Now, to get a good signal in a reasonable amount of time a meter like the latest one that Direct installers use is invaluable. But you can do nearly the same thing with a couple of tools.
Personally, I use DishPointer Pro to find a good place for the dish. I also use an Align A Site that allows me to drop the tripod nearly anywhere and use the bubbles on the align a site to level the dish. Once I have the dish placed and pointed to the right place in the sky I use the built in signal meter on the HR44 receiver to fine tune the dish.
The cheap 15 dollar beeper like RoyB has pictured are really worthless as they do not tell you if your on the right bird or not. That is the one thing nothing short of the Direct meter can do that for you. No matter what you choose practice at home first until you are commfortable you can do it easily and quickly.
And YES you can take the receiver from home. We have the HR44 Genie, and mini Genies, so when we get packed I grab the genie, a mini and the video bridge. My trailer is wired so all I have to do is connect a couple of pieces and ready to go.