Body Revolution newbie

Hi This is my first post. I signed up for myfitnesspal a couple months ago but haven't really used any of the tools yet. I'm on week 5 of Jillian's Body Revolution workouts. However I'm repeating week 4 since workouts 3 and 4 have been tough. Anyone else feel the same? I've decided to push on to workouts 5 & 6 next week even if I'm still struggling. I know I'm getting stronger but wishing the results were coming faster of course. The scale isn't moving much and I know I need to stay off the scale but that's hard to do. Still can't do plank to crescent ??? the way they do it in the video but I kept up today even though I swing my foot to the side. My drive is starting to waver but I have to keep at it. Time to work on eating better.