Does being obese make it harder for surgeons to go in and fix my gerd?

Probably yes: Gerd is reflux of stomach material back up into the esophagus. The esophagus is tighter at the spot where it connects to the stomach, but there is no actual valve preventing stomach material from being pushed up into the esophagus, when heavy pressure is applied to the stomach. A big obese tummy squishes up on the stomach, especially when one is lying down, making it harder to prevent reflux.

Yes and No: It might make the surgery a little harder but there is no data that shows hat obese patients have worse survival after surgery. Obese patients may have, depending on the type of surgery, a few more postoperative complications.

Obese and reflux: The typical obese patient will experience reflux. Reflux is a complicated symptom related to acid output of the stomach, esophageal clearance of the acid, gastric emptying, and the function of a special valve between the esophagus and the stomach called the lower esophageal sphincter. But obese patients have another issue, increased intra-abdominal pressure. Often, just loosing weight will help.