going to try and do some cab welding any tips

[mbc9ieII]

I am by no means a good welder. But my cab needs the rocker panels and cab corners i have all the parts and i also have floor parts that can be changed and i have the parts but may be easier to just plate it.

so are there any hints or tips you guys can give me to help figure out how to cut this cab and weld the new stuff in. I really want to do it my self. but dont actually know what i am doing. and help you guys can be will be much appreciated. Thanks guys.