How can I cut out a hole for a door in a steel building?

I have the door and door frame and extra lumber if needed. At this point, I’m just trying to figure out how to cut the door. I have a Skill Saw. Do I need a special blade or a jigsaw? Please advise.
Thank you everyone for your feedback. I believe I have the tips I need to dive in head first. Have a great one!

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I want to know which would be cheaper to construct: a steel building kit that you order pre cut and put?

together yourself, or buying a load of lumber and building it yourself. Know-how is not an issue, I strictly need to know if the square footage is the same, which plan is cheaper. For example, I found I can buy one of the aforementioned kits that cover roughly 800 square feet for about ,000. I am leaning toward the steel building kit and my husband is leaning towards constructing it out of wood because he insists here in GA it will be the cheaper option.

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