I actually don't have a warmth press since I'm presently planning my fantasy create room, however a trusty standard garments iron can take care of business, no issue. What's more, since I'm languid, I didn't play with hauling out my pressing board. I rather utilized a treat sheet to shield our lounge area table from the iron's warmth. 

For this specific brand of printable warmth move vinyl, I just set my iron to the Cotton setting (which is the most noteworthy) and made a point to not utilize any steam. 

At that point I gave a couple of passes on top of my still-plain (and clearly recently washed) onesie just to streamline any wrinkles and warmth it up. Then, I moved my plan over to the onesie (with a little assistance from a portion of washi tape) and got to pressing. 

I pressed everywhere on the cut pieces, applying even and firm pressing factor for around 15-20 seconds prior to moving to another spot (gracious, and I tried to eliminate the washi tape prior to pressing on the letters… .not very sure how it would respond to the warmth yet I'm speculating not well!).