I have a money site with 3 pages that is ranking for a few keywords on page 1 and 2s. I used articles that i bought for $10 each but decided to change them to a more "personal" or more informative hand-written content. 1-Will these affects my ranking in a way that I have to "restart" the building of backlinks and stuffs? 2-What if i also change my theme? 3-Should I do this in one shot or slowly change the articles and then move on to the new theme?