Hypertrophy workouts differ from strength workouts because, instead of trying to develop raw strength, you're trying to increase the amount of blood that gets to your muscles. That means you'll be doing a lot more reps with lighter weight. If you've been bodybuilding for a while, then you'll probably recognize this set-and-rep scheme. It's old-school, but if you finish every set, ever rep, and pay attention to how long you're resting, you'll see great gains.
Don't use the same weight for today's workout that you did for the leg strength workout you did earlier this week. If you can do 10 reps with the weight you used earlier this week, you're not hitting your strength workouts hard enough.
Focus on making these sets difficult. The last 1-2 reps should be tough to finish, but not so tough that you can't put them to bed. It takes a little practice to figure out what weight is best, so don't worry if one set feels better than another. You'll be a pro in no time.