[piocho]

Ok so what you are suggesting is to :

- create a time machine copy on an external HDD

- put the new SSD in the computer, restart it

- get the copy of time machine on the new disk

Will it be possible to reboot with the brand-new SSD inside the mac ?

[rbanffy]

No. The Time Machine part is for if everything goes REALLY BAD and for when you are reinstalling on the new hard disk.