yes, that's a very good idea, start braking miles away for the corner and once you have found a good entry speed for the corner then start moving the brake point closer to corner, it's a much better method than rushing into corners and then trying to move the brake point backwards as your braking markers are behind you !
that all sounds good, but putting it in practice is another matter, once your on the track it's hard to stop yourself for rushing about, i sometimes just go cruising.
cruise: just cruise see if you can do a lap without using the brakes, drive like your about to run out of petrol, set a limit of the max rpm you can use, just chill and have a look around the track, with no understeer or oversteer coming into play, feel how economical the steering movements are.
rally: see how out of shape you can get the car, going into, mid corner and on the exit of corners.
crash and go off: it's ok to crash, drive at corner way to fast, you might also get a surprise if you make it round, see what happens when you go off, do you get a cut track, does it take you 20 mins to get out of the gravel, do you go into hyperspace, this will help you to work out if it's worth pushing it to the point of going off at a particular corner.
please note: don't get hooked on driving rally style

, i use the above driving styles and a few more and have only named them to remind myself when i'm driving that i'm driving in say cruise style as i normally forget after the first 100 yards of a lap.
PS: it's one thing thinking this stuff, but it's another world on the track and FUN should be the biggest factor.