I also pulled a sturdy string through with my first cable, so that I had something to use for later pulls. Left a lot of extra length at both ends.
Get some of this stuff. Got a huge bottle for $7.57 delivered to my local Home Depot. Used a small amount, hardly measurable. Worked great. Easy cleanup and not messy, although I prepared for the worst, since I used it in my wife's tv room!
I'll never use it all.