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 50 years towing experience. Now my heaviest trailer is a 7,000-pound enclosed cargo trailer, RV is a 5,600 pound Skyline Nomad Joey 196S, and my tow vehicle is a 2012 F-150 EcoBoost SuperCrew.