I’d like to echo the same advice as Ginny. Dayhiking, weekends, or more–all with a full pack, and get accustomed to using what you’re carrying.
This will allow you to get used to the weight/balance issues, will help you get rid of unnecessary weight now rather than later, will help you learn how to actually use all that stuff, will help you learn how to most efficiently pack all that stuff, and will build strength.
You might also go to The Gathering this October, or one of the Rucks this winter, if they are convenient to you. Many prospective thru-hikers have learned a lot by attending appropriate seminars at events like this. You learn from those who’ve done it, and you get tosee and/or try out gear upo close and personal. Most of all, if you listen carefully, you can get a glimpse into the psyches of successful long distance hikers.
Skyline