Hey!
Check to see if there's any free advice centres near where you live. In Manitoba, we have a fab Immigrant Centre, which is part-funded by the Province, where any immigrant can get free advice on filling in the forms. If you can find one of those type of centres, you'll be getting a lot of face-to-face help and saving yourself some money!
As the previous poster said - use the forums, ask questions and you can do this. The guides with the forms are very helpful! Immigration is costly enough as it is - don't waste $500 when you can do it for free!!