Rifle zeroing help. HURRY!?

Try this first remove the bolt..set the weapon on sand bags or some type of bench rest and look down the bore from the chamber side of the weapon and line it up with the target bulls eye (set at 50 yds). After this try not to move the rifle and look through the scope. Carefully adjust the cross hairs (this is where it can get tricky) to where they are on the target dead center. The tricky part is I like to tap the scope lightly when I adjust the cross hairs..each and every time I move one..you may have to re-adjust the bore to stay on center of the target bulls eye. Once you have done this your pretty much bore sighted and can squeeze off a shot to see where it prints on paper and the process (excluding the removal of the bolt of course) starts all over again. Once you have it printing at the bull use 3 shot groups just to make sure. After your satisfied it is the time to move out to 75yds. squeeze off a round and make adjustments..them it's on to 100 yds and so on till you get it where you want in yards for a zero...then it's all fine tuning from there. It is time consuming to do this drill I know..If you want you can buy a bore sight kit.. but why spend the money on something you really don't have to?