I've bought some nursery stock. junipers, procumbens nana & communis, they're in plastic pots pretty damn small ones. is it too late in the spring (just started last month of spring) to repot them into something bigger for training/growth?

Sounds like you are in the southern hemisphere, so no it is not too late, particularly if you are going into bigger pots. If it had been deciduous I would have had a different answer,
Geoff.

thanks heaps geoff! and yes in the southern NZ to be exact