How do you iron a shirt at home to make it look like it was newly bought from a store?

Yes, it is possible. Use a little spray starch on the sleeves and the collar.

The hard part is getting the pieces to be as clean looking as you wish. The best way to have them look brand new is to take them to a professional launderer. But it isn’t cheap.

I worked in retail for years and we usually steamed garments to take wrinkles out before putting them on the racks.

I agree with the jelly above that a little starch and iron can help crisp up a shirt if that’s what you want.

Don’t even try. Take it to someone who does it for a living.

It’s possible, but knits are a bit tricky to iron. Have you tried a wrinkle release product that you spray on, then stretch the fabric a bit and hang to dry? I find they work well.