Only use Nissan coolant.
Molyslip, you need one tube
If you are doing gearbox oil then I'd recommend doing the rear differential oil whilst you are there, same procedure as gearbox, very easy.
The Brembos are easy to bleed if you take your time, however you may prefer taking it to a mechanic like you say. If you do end up doing it yourself, the old fashioned two person method works best and be very careful of the bleed nipples as they can be seized, soak them in a proper penetrating fluid. I'd say any good DOT 4 will be alright, as you say you aren't tracking or driving the car hard so won't really benefit from the premium fluids.