Absolutely the foolproof method. If you don't have a line winder, you can always use a variable speed drill with a dowel or another reel to take it off and reversing the procedure. A bit more more work but well worth it. You'll be sorry if you cut your backing and find out you should have used more. Yes you can splice it, but the fewer knots/splices the better imo. Just remember not to fill the reel completely because when everything is wet for one thing, it will take up more space. I even had a fly shop put backing and line on a reel for me and they guessed the amount of backing, spliced it to the fly line(quite an elaborate splice by the way) spooled the fly line and didn't have enough room.They missed the fact that the line was 110 feet instead of 90..........had to redo the whole thing. Good luck.