UV mapping

I hadnt done any UV mapping over the weekend but i have just started it. I started about 2 hours ago and have 4 parts of the model mapped. UV mapping is probably the hardest part of model making for me, just because of the fact that it takes so long to map it without scripts for one. Also getting all the mesh mappings to keep their size ratio against each other object is also something I find difficult, but am getting better with it.