Python habitat noob questions...

[radecki]

Considering a pet snake...
Doing all sorts of research.
Decided a ball python would be a good start. Although not really considering more than one reptile.
Found a couple breeders that i can drive to and actually see the place and animals to make the choice instead of picking online from a picture.
The question is....

If I end up picking a smaller snake, holding in a bin for a while, until the snake is a bit larger, then transferring to a proper terrarium, I was not able to find too many details on this but am I believe that there is no major issues transferring a snake.
As a follow up...
Is starting with a large tank and blocking portion off and adjust to fit the size of the snake over time a practical thing to do?

I don't mind spending money, but I don't like spending money unnecessarily.

I would rather get a nice tank and make it work over time, rather than start with a small tank and have to change it a couple times over a year or two to fit the snake size.