If this is your first time, and you're doing it by yourself, just break it down into manageable chunks. A 220 ft2 area is easy to do by yourself, so just do four of them, at least for the primer. By the time you get to the second coat, which is usually considerably easier (since you'll be coating a slick, smooth surface) you may just want to do it in 2 sections.
Read all instructions, have everything ready and materials at hand, know product ratios and proportions, work carefully and you'll be fine.