Works every time, Image your C OS Disk, shut down your notebook remove C OS Drive Put in new SSD, restore image to SSD. Macrium Reflect Free will do that with out issues. You can't run two versions of windows on the same computer at the same time. There is no reason too, your hard drive can be set back as long as you like or format it and use it for data you still have the image you created. Here is a video doing it the Clone way. With MR when you restore your image pull down each of the partitions in the image to the SSD when you move the C:\ partition down to the SSD right click it and bring up properties adjust the partition to fit your SSD. Don't change the size of any of the other partitions and yes you need them all and in the order they appear on your Image.
Well then you will need to pay for a 2nd copy of windows one or the other will de activate. I usually shut down after a clone and remove the old drive. Save it for some other time in the future where you might need to RMA or just resume work after a failure. Usually I go the Image route that way the original Hard drive in not even in the notebook when you restore the image. If you chose to have both in at boot time as soon as the start up starts hit the Esc key spam it, timing is critical, anyway that will bring up a Boot menu where you can choose which drive to boot from
how much faster does your boot time become?