Hi everybody!!!!
Thanks so much for your replies.
I have just got the Virtuoso Pianist book and have a glance at it. The ideas look very similar to a book called Pumping Nylon that is meant for classical guitar.
Probably because I have a 'guitar' pre-perception, the first exercise is a double note scale run which looks difficult to me .....

Anyway, I am really glad to start of with a good exercise book, as this is something I really missed throughout the years of learning/playing the guitar.
Though I am teaching guitar a little now, I think I belong to the group of teacher "who can't teach" as mentioned in Chang's book :p
I am really glad that at least my quest to play the piano has at least make me aware of many things and mistakes I have been doing all these years.
hi maestoso,
Really glad to hear from someone who has gone through it all.
You do mentioned something I'm having some doubt on, i.e. the hands are not developed equally.
And practising hands separated should be a great help.....
In fact, I am guilty to say that I have seldom do this all these years, untill the read the Chang book, now I try to run through the chords with my left hand on the fingerboard before I play hands together. It has not only benefitted myself, but also especially on students who don't practise that much and have trouble remembering....
Eagerly waiting for more advices !!!!

Han Ming