Paraffin (kerosene) also is a good cutting lubricant for aluminium, particularly when drilling. A bit messy for tapping.

If one has never tapped before, then I'd suggest practicing on a piece of scrap first.
Unless you're planning to do this on an industrial scale, I wouldn't say that these tapping alignment aids offer good value for money. A taper tap (followed by a "second" then a "blind" or "plug" tap if you wish) in a hand chuck will be sufficient for most through holes. The trick is to start the thread accurately, Place the tap in the hole and, concentrating on keeping it aligned with the pilot hole, turn it gently ahead until you feel the teeth bite. then reverse just a fraction to remove the swarf. You'll be able to feel when it's removed the waste. Repeat again, turning no more than 1/8th turn at a time until you've got 2 full rotations of the tap. Then you can probably increase to 1/4 turns, if the pilot hole is well and adequately lubricated. Aluminium is notorious for grabbing, so it's "slowly slowly katchee monkee". Using the drill press as the alignment tool does work, but my experience of trying that was that the force needed to turn the drill press tended to mask the sensation of the tap cutting and binding. Once aluminium has grabbed something the size of 4mm or so, you're in real danger of breaking the tap and leaving an unrecoverable stump in your engine mount.