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If you are not strong enough to rub a car out by hand, I'd be real concerned about you using the mentioned 7" buffer / sander. These tend to be heavy and difficult to control making injury not so far away. This type of buffer needs to be held at an angle otherwise the pad will grab from the other direction and throw the buffer. ( Think of a single disc floor buffer. ) Even worse, when they catch an edge, the paint will burn through in short order.
A dual action orbital buffer is more easily controlled. While some may look like a standard buffer, they have an eccentric that allows the pad to oscillate. For these, the pad can be held more or less flat and if it catches an edge, the pad will stop but the motor will continue to run saving you from injury.
Have a look at this one Home Depot sells for ~ $30 BLACK+DECKER 6 in. Random Orbit Waxer/Polisher-WP900 it has a handle on both sides and will be much easier to control. When buying a buffer, get one that uses pads the either velcro on or have a mounting hole in the center as the tie on ones tend to come off.
Get a spare pad or two as you don't want to use rubbing compound and wax on the same pad. The pad is cleanable by scraping while in use and washable when you are done.
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