yup, this is how I do mine.@Jeepeto - Sorry I haven’t chimed in on this yet, I’ve built at least 50 or 60 headlocks in the past.
Put the wheel on a 5 gallon bucket with a blanket on it. This way the tire sags down and is a lot less likely to pop off one side when getting the opposite side on. With it sitting on the ground the tire wants to pop up.