In my opinion -- there's no way to know if you'll like long distance hiking until you've done it. What exactly is "long distance" -- well, that's hard to say. I had done quite a few hikes of 1, 2, or 3 nights in the woods, in the White Mountains and the Adirondacks, before attempting a thru. That's not quite enough.
The gear issues sort themselves out, usually within a few days or weeks. Setting aside money issues, injury, family emergencies, etc., it's the drudgery, repetition and tedium of a thru-hike that cause most folks to leave the trail. And leave they do, even after months of trying.