Newbie fed up with so much misinformation on set up of a TT

Use blocks under the low side tires. Some people like to block only one tire some like to block both. I block both always.

After you are level side to side set your wheel chocks and set them tight. Use at least four chocks, block both sides front and rear so the trailer cannot roll.

Disconnect from the tow vehicle then use the tongue jack to level front to rear. Your trailer should now be level.

Use the stabilizers to stabilize the trailer if you like.