Usman Ghani bhai,
If you are just going to Skardu then i think you have to subtract 2 days of traveling bcoz it will take almost one day from Rwp to Skardu and same for coming back.
Last October i went there by hiring a GLI car from Rawalpindi to Skardu and the guy was very very good driver, his name is Naveed ( 0321-5509555 ) and he took us to nearby places on his own car without extra charge and he knows all the places very well which u can visit around Skardu.
He has some links to have accommodation as well.
For places which u can go on car around Skardu are: Kharpachoo Fort, upper and lower kachura lake (entry closes at 5pm so go early), Buddha Rock, Sadpara Dam, Shigar fort, Katpana desert and Sarfa Rangah(cold desert) on way to Shigar, Manthoka Waterfall.
Deosai plane (you have to go on jeep),
If you need more help, pls let me know.
Regards,
Aqeel