What I did was put the derailleur over the large cog on the front, adjust the high-limit until it was where I wanted it when I pushed on the derailleur by hand. I had my wife hold the derailleur while I loosened the cable nut and pulled the cable taught and then adjusted it finely using the barrel adjuster. This way I got it right where I wanted it over the large gear and used the barrel adjuster to fine tune it.
Doing it solo I would use a zip tie to keep the derailleur pushed in. It's essentially the same thing as the poster before me is saying but I used the high-limit to do it instead of a pencil

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There are other ways to do it - the directions to do it are a bit different - but I was having issues with chain rub in the largest cog so I adjusted it at that point and the rest 'fell into place'.
You can do it exactly like they show in this video but it was more difficult for me to get it to quit rubbing on the larger gear this way.