zacharie,

9.5/10 or 3/10 just refers to driving to 95% or 30% of the car's/driver's limits.

You can drive perfectly well on the street without heel and toeing by all means, using heel-toe just makes downshifts a bit smoother, the sportier you are driving the bigger difference it makes since in that case you are less aggresive on the transmision and you improve traction of the rears and do not upset car's balance on violent downshifts coming into the bend.

Only way to revmatch while braking is to heel and toe. If you are not braking you can just blip the throttle with your right foot while the clucth is engaged during the downshift, but in that scenario usually rev match is not that necesary.

You just need to hee-toe when downshifting, since its when you are changing to a shorter gear that will bring engine braking to the traction wheels when you let the clucth out.

You will be surprise to see how many drivers put out good lap times without heel-toe, its not night and day differerence and also depends on the car and place. Furthermore one thing is to master it for street spirtited driving, another is to master it to work well at the limits the car is taken at the track, you really have to be quick and get it perfctly right otherwise it may slow you down.

Just read up on it and practice like we all did, its not hard at all, anybody will eventually learn it. The problem with econo cars is that the pedal placement may not be ideal for heel and toe so it may make thigs difficult for a beginner. The 996 is perfect since you start progressively and you don't run the risk of doing anything bad.