Okay, to overcome your fear of ladders, just picture everyone around you in their underwear. Wait. That's fear of public speaking. Umm... Ladders.

Practice. Get up there and get comfortable. The more you are on a ladder, the more comfortable and familiar you will be. I HATED ladders and heights. I did it because I had to. Now, I am comfortable because I spent a lot of time going up, and coming down. Keeep working on it and you will be fine.