Suggest you do a li'l more reading brah, because what you "heard" was not correct.

If you wait for a plant to need transplanting, and let it get good and dry.
The rootball will become a solid mass.
You can slide a butcher knife around the inside, give it a good rap,
(turn the pot upside down with your hand on the soil surface and rap the pot's edge against the table's edge surface),and the rootball will come out and stay intact.
Might not even need the butcher knife.
When dry enough, most soils will pull away from the pot all the way around.

Set it into well prepared, moist, (not wet), soil in the larger container.
If you put the old pot in the newpot first, on enough soil to bring it level with the rim, and then back-fill around it, you will have a perfectly shaped hole to set your rootball into.
No stress at all.
Leave it sit for a day so the thirsty roots will go water hunting, then you can lightly water the rootball with the same kine water you used for the up-pot soil.

There should be no transplant shock when done this way.

Take some time to dig through the archives here.
This and a lot more is there for the reading.
Just click the everyt'ing link in my sig. and you're on your way to being a happy grower.

Aloha,
Weezard