Bobcats are expensive, you can use a dingo digger yourself or even use a hand held rake and spade.
But when I layed some LT i sprinkled in a bag of cement. as said above, dig up and remix and you will also need to top it up a bit..
Think about concreting, it costs about $250 a meter here and is fairly easy to lay yourself, do it in small sections, of about 3m max. I think they have a min delivery amount.
Make sure you use REO for the diverway and about 75mm thick, hosestly it is fairly easy..
If any of your friends are concreting then offer to help them so you can learn some tips.
Plan to do it in about 6 to 12 months time, that will give you time to learn how to do it.
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