Who has naturally Medium blonde hair and has gone Platinum?

I have always wanted to go to my childhood color of platinum blonde. I do everything in the summer do utilize the sun and just crave it to be lighter - in the winter I get pretty dark blonde to a dishwater blonde and hate it. Anyhow I really would love platinum blonde hair but dread the upkeep. I had heavy highlights before and hated that my roots looked brown when they came it and hated looking like I was a bottle blonde through and through. I know you natural blondes know the struggle - we want to be proud of being natural blondes yet we want our lighter childhood blonde back. Anyhow if I do this will I have to go to he salon every month to avoid the root look? what will this entail this look? Will it fry my hair? is there a way to do it myself? do you regret doing it? if I change my mind later and want to go back to natural will I go through a hellish process? give me some info please. Thanks