Using these TBS ETHIX V2 400mm GoPro straps is a breeze. First, clean the surface where you'll attach the strap on your GoPro to ensure better adhesion. Then, place the strap on the desired spot and press gently for a few seconds until the rubber - like coating sucks on firmly. When using multiple straps for different rigs, make sure they're evenly placed for balanced support. As for maintenance, avoid exposing the straps to extreme heat or sharp objects. If they get dirty, you can gently wipe them with a damp cloth. Remember, don't pull the straps too hard when removing them to prevent damage.