Dude, my post is mostly to add to the "I've done this too" to help you feel better about that. Newbie, flying backwards, no spotter ... it's not hard to do.
Long story short: mine was about 100' feet up, but next to a large water tower. In summer, so no rains. I was able to get it down after 3 days with a bow & arrow and strong fishing line. But I was able to do so from about the same elevation, not from the ground.
It's still worth getting down even if it never flies again for: battery, SD card, and parts.
Parts: if you buy a new drone (same model) and later crash it, you might find that one of the easier parts to break on a Phantom is the gimbal assembly (the arm and ribbon, etc.). Those are relatively easy to replace, but the cost of the assembly from DJI is about $350US, probably more if you don't have a DJI service center in your country that inventories the part. So if you can get it down with this assembly intact, that makes it worth it over and above the battery and SD card.
Bonus: you would also have a new charger with the new model, so having 2 means charging 2 batteries at once. Also, you would have a spare remote then, so you could sell the old one.
Good luck!
Chris