I start with the long part of either the top or bottom and lightly glue each piece to the next piece and tape them with Tamiya tape {make sure the track does not glue to the wheels} I continue around leaving 1 piece out then remove the track and paint/weather
you can see in the picture one finished and one in the process. these will only be painted black as I am doing a tank in an Israeli Museum so they keep painting to cover the rust
some suggest not gluing the wheels on and remove the wheels to remove the track. That is what I started, but find this easier. Keep in mind the multiple small sections going around the ends should be glued one at a time, with each drying before the next one is glued, I find it hard to hold several in place while they set so I glue one and well, come here and answer a question
I find it hard but not impossible to paint on the tank
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hope this helps,
Dan