Take a look at Dixie's videos at:

https://www.youtube.com/channel/UCQhqmV26773qZhzqJz4VFcw

She hiked the AT in 2015, having never backpacked before. Then the PCT in 2017 and the CDT this year.

Lots of good advice (several hundred videos) and entertaining, too.

I believe she used one of the Osprey packs on the AT, and went to a lighter one for the other trails.
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Always remember that you are absolutely unique, just like everybody else. -Margaret Mead