It's not overkill. If anything, you'll soon find it to be a little cramped once you discover that everything is good on the grill. Soon, you'll be upset that you didn't get a larger model because you want to slow cook a whole chicken or roast (fantastic).
The key to mastering a charcoal grill is to learn how to play with the coals, more on one side than the other, the "valley" method, or the lovely volcano of center-stacked heat. This way you can have an area for searing meat, another area to slow-cook your delicate veggies and another area to keep food that is essentially done warm.
My main recommendation is to resist the temptation to open the lid constantly. let it cook slowly and once you are comfortable with how the coals behave, you'll spend more time sitting and sipping a beer than fussing with the damn grill. Remember, constantly poking at the food and checking it delays the cooking process and will actually screw things up.
You can reuse coals, but it's messy. I just use as much as I need (most people use wayyyy too much) and let it burn out when I'm done at the end of the night. I often throw my fats and shavings on the leftover coals to get rid of the leftover bits that shouldn't be composted.
Also, don't use lighter fluid. Please. Learn to use just a tiny bit of newspaper. It's not hard, it doesn't take any longer, it spares the neighborhood that awful chemcloud that makes your head spin and yes, you can taste it in the food.
And use lump charcoal.