Marty - never sell yourself short - we all started somewhere and all you need is a passion and some patience. Once you catch the bug and gain some confidence, you might surprise yourself !
The fact that you WANT to do it - is a great start.
Thats a great Pinball you have picked up "as is"/ Funny thing about Childs/MarkC's Pins - their "as is" machines look BETTER than other dealers "shopped" pins... So the "canvas" you are working with will turn out to be a masterpiece..
Keep the updates coming !