I just got P90X in the mail and I'm so excited to start! I have some ?s though. I currently have 8 lb weights that are appropriate for me for most arm exercises. Will I need heavier weights for other exercises? Also, do I really NEED a pull-up bar and a "perfect pushup" thingy, whatever that is? Money's tight with the wedding and saving for a house so I'm trying to figure out the minimum I can get away with, haha. Thanks!