Assuming you have an adjustable shank, that's not a difficult job. If you torqued the bolts that attach the head to the shank to spec, then you'll maybe need a cheater bar to loosen the nuts. But every good shade-tree mechanic has an adequate cheater bar handy.
Before you tighten the nuts again, get the rig as level as you can using your eyeballs. Then verify that the floor of the trailer is level using a 4' or longer carpenters' level.
__________________
Grumpy ole man with over 60 years towing experience. Now my heaviest trailer is a 7'x16' 5,000-pound flatbed utility trailer, my tow vehicle is a 2019 F-150 Lariat 3.5L EcoBoost SuperCab with Max Tow (1,904 pounds payload capacity).