The first time anybody does something they have never done before, they always think they aren't good at it. I'd say the next time you had to do it, it would go better.
I have a leak somewhere between the pump and the pond and I don't think it's in the waterfall. I have been adding water twice a day because I have the shutoff float when the water level gets low so I either need to find the leak or have Pete put in a float like yours.