Install a trellis either before planting the grapes or just after they are planted. Position the trellis over the grape plants so they can crawl up towards the trellis as they grow.
Use pieces of twine to attach the vine to the trellis as it grows. Start tying the vine to the trellis when it is close to halfway up the structure. Use loose, overhand knots to keep the vine in position without strangling it.
Tie up any loose grapevines as they continue to grow. Stray vines or new growth need to be tied as they appear throughout the season.