Most of the exercises you'll do today should be familiar to you, particularly since this is the same workout you did on Day 3, Week 1 of Ripped Remix. But don't confuse "familiar" with "easy." The supersets will test your endurance, especially when you start to get fatigued. Do your best to complete the reps as prescribed, even if you have to take a little break.
Weighted dips can be done in a variety of ways. You can use a weighted vest, a dip belt, or you can hold a dumbbell between your ankles. However, if you struggle to perform dips even without weight, then don't use extra resistance.
If you need assistance performing dips, fine, use a dip machine. It's important to still challenge yourself, though. For instance, perform as many reps as you can without assistance before getting some help. Don't settle into doing the same weight each week. Every workout should be harder than the one before.