Laptop HDD is 2.5 inch. SSDs are available mostly in that same form factor. So, yes, it is really just remove one, and plug in other. Of course, you have to transfer everything from the old HDD to the new SSD. I use the most excellent Macrium Reflect software to do this. It is free. And here is the cloning guide. Also, you do not need the same size SSD as the HDD (in this case 1TB). Determine space used in the HDD + factor in the amount of space you would need for data & programs + some buffer. I never needed more than 250GB in a local disk. But then again, I do not have games or any programs needing 100s of GB space either. I always use 250GB SSD nowadays, and they are more than sufficient. I do keep a lot of stuff in the network drive.
But that is a no go in Costco. So good ole Amex Platinum Cashback. BTW, Amex is going away at Costco sometime April next year. Then on it is hasta la Visa