Normally you *don't* score yourself... at least you'd better not be if you're turning it in for record. I'm sure everybody is honorable and all that, but for the sake of keeping things clean, it's best if people don't score for themselves outside of practices... ever.
What you can do (and under some circumstances it can pay dividends) is plot your own shots. It's separate from 'keeping score', mostly for your own edification so you can see more than just the last shot on the target. Sometimes being able to see a pattern develop can give you a hint which way you need to twist the knobs on the scope
Also, if the guy who *is* scoring for you gets distracted (someone talking to him, watching someone else's shooting, or just fell asleep - seen all three) and there is a disagreement over the score and/or how many shots were fired, it helps sometimes to have a plot sheet handy to argue your side. Plus there are usually blocks for recording zeroes, keeping track of how much you moved the knobs, etc. (handy for putting them *back* where you started at the end of the string), and where you called your shot at i.e. did you break the shot holding dead center, or were you holding high and a little right?
If you search the net for 'plot sheets' you can find a bunch. Just make sure they are newer and have the 1/2 moa X-ring for F-Class targets, not the 1-moa sling targets.
If you don't have Excel at home, you can always download a free viewer from M$ on their website. You won't be able to do more than open it and look at it and maybe print it, but it should allow you to do that.
Good luck,
Monte