Generally speaking getting a visa after you are accepted is pretty easy. Your visit has structure, a clear deadline, and nay number of student/internship/etc visas may apply.

Visas for “I just wanna go to USA for a meeting” are harder if you aren’t from a visa waiver country.

(funnilly if you are from visa waiver land, getting visa after acceptance is more work than for the interview because you actually need one)