Remove furniture from the room
Identify the loose or wrinkled areas
Trim or remove baseboards if needed
Pull up the carpet edges from the tack strips
Use a knee kicker to position the carpet
Use a power stretcher to stretch the carpet across the room
Hook the carpet back onto the tack strips
Trim any excess carpet along the edges
Reinstall baseboards if removed
Vacuum the carpet after stretching
Repeat if wrinkles remain