For satin finishes don't bother about sand paper and its different grades. Use bronze wool (fine). Available at homefix. The 3m sanding sponges works well too. Get the grades that are yellow coloured. Then sand. This is what most people do to obtain a satin finish for their neck if glossy lacquer irks them. Just extend the same concept to the whole body. Been there and done that personlly as well.
thanks guys for the suggestion...i m starting to sand my guitar everyday after work...hahaha......anyway....bro Chan Min....I remembered you did some upgrading on your MIA strat pickguard....may i know what is it??how much does it cost to do it??