When tronious says you must be self-disciplined he isn't kidding, there are times during this workout that you will want to quit because you are so damn tired or your muscles have just given out.
I would recommend a few weeks of less intense gym work before you jump into Titan Training.
One other thing I notice, and I may be wrong, but it seems like Titan Training aims more at getting the overweight person ripped (hence the ketosis diet it suggests) than the thin person bulked. Either way, however, you WILL be sore after these workouts. I've been using HIT principles for the last 6 months, and when I jumped into Titan Training I could hardly walk the first couple of days.