Problems

Im having problems creating my cars. Whilst there are endless tutorials on the net I cant seem to make a breakthrough and all my projects seem to be ending up with a mess of mesh! Ive spent around 30 hours in the last week or 2 on the project but all i have to show is half a poorly modelled car! I am enjoying working with Max though, however I am worried that it is taking me too long to get to grips with it. I must have achieved the car models by the end of the holidays. Hopefully once one is made, the others will follow more easily.