For the record, it took me approximately a year, maybe a little less, to go from damaged credit (sub-600) to decent (I am at like 675 now, where I have stalled a bit). I got started by netting myself a 300 dollar limit card, buying shit with it every month, and then paying it off every month. I eventually added 2 more credit cards (1 at 700 and another at 1500) and I kinda do this juggling thing. I make smallish credit gains month to month (though buying my new pricey laptop has stalled me almost totally this month), but I think I am in a position where I have to make a big real purchase now, like a car, if I want to make more major progress.