You don't boot from the drive from your old laptop. You boot from from your current system (select that on your mobo), then access the 2.5 drive as if it is a data drive.
O right thanks for that! Would have tried that only I don't have any extra cable to connect it from what I can see around my case. I guess I should buy a another sata cable and maybe a 2.5" drive slot so I could just permanently have the extra drive there.
This would be doable right? Forgive me I am a novice lol.