Jim, depending on your installation requirements, the cost of buying or renting the tools may be so close to the cost to install the carpet with padding that it is not worth doing it yourself. You will need a knee kicker, stretcher and possibly a seaming iron. If you had carpet there before in the 2 rooms, you probably already have tack strips. You might be able to get a little break if you install the padding and a staple hammer gun will be a big help here. The installers normally expect the homeowner to remove the old carpet, padding and staples and have the floor reasonably clean. Your source for the carpet should be able to give you the name of an installer.
I put indoor/outdoor carpet in a basement room and it is not glued down but has stayed in place nicely for many years. If you change carpet later, you have to remove the glue then too and this is tough.