You don’t need two people. You do need to remove the lines from the handles and the kite. Stake the lines down to some immovable object (fence post, ground stake, trailer hook, etc.) and then walk the lines out and see where all the ends terminate. Ideally they are all equal but if they are off by a half an inch or so that’s not bad as you rarely hold your handles dead even if actively flying the kite. You may want to compare the two power lines together first and then the two brake lines and then all together. The power lines and brake lines are of different strength and will offer different levels of resistance when stretching / checking lengths. In the end, all lines should be the same length under a bit of tension. The brakes will stretch easier but won’t ever be under the same tension as the powers so less likely to stretch.
Here are some videos to help you:
you aren’t flying on a bar or a depower setup but this one offers a means of tying off to a tree.
If you aren’t familiar with parapacking – I highly advise you check it out https://www.racekites.com/how-to-fly-pa ... king-away/
and here is a video of the process
looks like a mess, works like a charm.