Actually, two step ladders so I didn't have to keep moving one. You can reach a little over half the windshield with each. -- then lightly tape the decal until you get it positioned where you want it. Then put more tape on it per the instructions, to hold it in place. Take your time and be patient. Enlisting your significant other, or friend, to help on one ladder and removing tapes will be a big benefit - my wife was working
Also, the instructions say to get the decal where you want it and take off the bottom tape from half of the decal then apply the decal and squeege it down - then remove the top tape and move on to the other half. Then remove the bottom tape etc etc. This didn't make sense to me sooooo....
I got the decal where I wanted it and and applied some blue masking tape to it so it wouldn't move for the next steps. Then I took off the bottom tape from half of the decal and cut off the bottom tape while holding up the decal. Then, while still holding up the decal I applied the decal to the windshield by holding it up firm to keep any waves out - but DO NOT stretch it -placed on the windshield and squeeged it -
Then I moved to the other side and took off the rest of the bottom tape off the decal while holding up the decal then applied the decal to the windshield by again, holding it firm but DO NOT stretch it. Then I and squeeged it - at this point I had the bottom tape off the entire with the decal on the windshield and the top clear tape still applied on the entire decal. Then I went back and squeeged the decal more - this will help remove bubbles and help the letters stick to the windshield to aid in the removal of the top layer of tape without "lifting" the letters too.
Then I removed the top tape from the entire decal - do not pull up on the tape or you will/may "lift" the actual decal off the windshield -- not good!, but slowly pull the tape when it is layed down flat on the decal - you'll see when you get to it - also the instructions are well done but it didn't make sense to me to remove the top tape from half the decal
Thats pretty much it -- You can get the squeege from a body shop or paint store -- it has to be flexible, not metal and about 3 inches wide.