Step 1 Rub the sticker to be sure the transfer tape is properly adhered to the decal (transfer tape is either clear or a masking tape finish)
Step 2 Clean and dry the desired area. Stickers will stick best to clean smooth surfaces.
Step 3 Mark where you want to put your new decals with masking tape so you can have an easy placement once the paper backing is removed. If doing a large decal, a laser level will make the best results for placement.
Step 4 Remove the paper backing slowly making sure the sticker stays adhered to the transparent transfer tape.
Step 5 Carefully position the sticker to the desired area. You can always use tape to make sure the decal is straight. (See back to Step 3) Note: Once the decal sticks it will be nearly impossible to re-position without destroying the decal. Once you found the location of choice, remove the backer paper (has lines on it) and rough apply with your fingers to make sure the decal doesn't try to fold over itself before you run a credit card or squeegee to completely apply.
Step 6 Use a hard edged object like a credit card to make sure the entire decal is fully adhered to the surface before you try to peel back the transfer tape (looks like masking tape/clear tape)
Step 7 Slowly remove the transfer tape. Making sure no part of the sticker remains on the transfer tape.
Step 8 Check for air bubbles. In most cases air bubbles can be worked to the edge of the sticker, but if not, a pin hole will allow the air out and become virtually invisible, once the bubble is gone.
For Advanced applications, You can use a spray bottle of water mixed with 2 drops of dawn dish liquid to have a wet application. However, You will need a heat gun / hair dryer to make sure all of the water comes out behind of the decal or it will be able to slide on your surface. This technique is just used to make the water feel smooth / lubricated and it shouldn't saturate the decal.