Just like you noticed last week, today's workout will be just a little bit harder than it was the previous week. The best thing you can do for yourself is to use just as much (if not more) weight as you did last week.
One of the most important parts of Phase 1 is creating a base from which the other phases will build upon. The more work you put into the beginning of the trainer, the more you'll be able to challenge yourself later on. All that hard work translates into the thing we're all after: progress.
I also can't stress enough how important it is for you to maintain a healthy, balanced nutrition and supplementation plan. If you want to lose fat and build muscle at the same time, what you put in your body matters. Please refer back to the Phase 1 nutrition plan if you need reminders.