Lowering can be done cheeply or dear depending on you money.

Cheep £60 springs or £2000 on coil overs
Easy as that.

Brake, i have converted both front and back on mine ST170 on the front and 2.0 on the rear.
The rear as easy taken 30 mins to do with 2 of us working on it.
All you do is change the drum to a stub axle, you can put up the full kit on ebay second hand for about £100-£150 but worth it.
Make sure they have the hand brake cable with it as well.