yeah fair play to Linda for asking how to do it properly. We'll all be glad to help you as much as we can. Lidl stuff is never the best, but it should work a few times. Just so long as its the type where you wind the doodah to the correct number and then it clicks as you apply pressure and not the stupid ones with a big needle. If its one of those ones then I would be advising you to take your money back.
Dave, the air tools that the F1 guys use are possibly a slightly higher grade than the local techie in the local garage. I know my air impact ratchet has only 1,2,3,4. What torque does that correspond to?
Also they only use one wheel nut to hold the tyre on. Our cars use 4, so uneven pressure begins to be more of a factor.
If you're doing the water pump, I would heed Adam's advice.....proceed very carefully cos the bolts will more than likely be seized into the head, and if they are, then they'll probably snap flush with the head, meaning lots of foul language and extra work to get the snapped studs out.
To see if you can avoid this happening. I would warm the car up thoroughly before starting, and then once its completely hot through, fan on etc, turn off and let it cool for about half an hour so you don't burn yourself. Then the hoses will be softer and less likely to stick to the radiator when you try and pull them off to drain the system. You'll need to get a helper to jam the water pump pulley with a big screwdriver so you can undo the nuts on it.
Once that's done, you'll get onto undoing the water pump bolts themselves. Use a spanner if you can to put reasonably firm pressure on if you can and then if nothing's moving, keep steady undoing pressure on and hit the nut or spanner near the nut vertically, which should help give it an impact force, don't try and hit the nut or spanner horizontally, ie: in the direction you're trying to undo it...that will over force it and you run the risk of snapping it. If its seized on the pump then a little WD-40 the day before will do wonders, if its seized into the head then that won't work, but a little heat directly onto the bolt might. Once you've got all that off, you need to extremely carefully scrape all the old gunk and gasket off the head, being careful not to damage it. and then refit. This is where the torque wrench will come in handy so you don't overtorque the waterpump bolts.
Anyway, I've rambled on far too long....let us know if there are any questions.
If you're a seasoned pro , fair play, but I don't think many of us are, so encouraging people to not do things by the book is a bit dangerous I'd say. I mean we've only just (nearly) got rid of Hugh... 
