My beautiful wooden deck is in serious need of some TLC. I bought my home 27 months ago and over the past year I'm noticed rot in several boards. Rather than hire someone I'm thinking of a DIY project. So I'm hoping for some advice on how best to go about this. Here are a couple photos. The first show a couple places where boards, or sections of boards need replacement. The second shows a closeup. I'm trying to decide whether to replace just the section between the underneath support studs or replace the entire length. The glove in the first photo is where that board ends. About every foot there is either a pair of square head screws or a pair of nails securing the board to the support. To just replace the small section near the glove in the second photo I'm guessing I'd need to cut the plank above the support in middle of that stud in order to secure new piece there. Or is it just easier to replace the entire 20 foot plank in each case? In this last photo the rot is restricted to the first few inches near the step and the glove marks the location of the underlying support. Need to repair, seal and paint this deck soon before it goes to s%#t. Any other suggestions for methods (repair, seal, apply paint, etc) to get this job done greatly appreciated.