Gather balloons in desired colors and sizes
Gather a balloon pump, arch strip or fishing line, scissors, and tape or hooks
Inflate balloons to varying sizes for a fuller look
Tie each balloon securely
Attach balloons to the arch strip or line in clusters
Alternate balloon sizes and colors as needed
Fill gaps with smaller balloons
Secure the arch to a frame, wall, or stand
Adjust balloon placement for shape and balance
Check for loose balloons and reinforce attachment points