manual mehtod is better obviously, the risk is there of shipment damage (but if the parts are new then there will be warranty ofcourse)
to get more details you can contact galaxy, beliscity because these ship pcs in a lot of towns in pakistan. Try to buy the hard drive first as their
rates are still increasing day by day.
beliscity where you can find hard drives:
galaxy where you can find rest of the items:
if you are going for shipping i would suggest get galaxy to get all parts fitted together except for the hard drive (these are too expensive on galaxy there but not on beliscity ,
get the hard drive from there as soon as possible)
then when you get all the parts shipped to you, take it to a local store, have them put in the hard drive and windows and you are good to go.