Most things are better to just pay someone to do it right. Carpet tile however is pretty damn slick though and I'd do that myself given a nice squared up job. Maker sure you get at least a few bids on it though. I just recarpeted my business and the highest bid was double what the lowest one was. Went with the lowest and they did a great job, they came recommended also so that helped with the decision as I know the best price isnt always best.