The disc has a 'disc' part that the footbrake works on as well as a 'drum' part that the handbrake shoes use. The handbrake shoes have worn into the drum creating a lip thats preventing their removal. The springy sensation you feel is the shoes being pulled against the steady springs and pins. More of that later......
You can do one of two things. Firstly (and recommended.....) wind back the adjusters within the hub. Check the howtoo guide again to see what you are trying to find.

The adjuster is the cog device at the top of the hub between the two blue shoes in this piccy. The steady spring is the one at the centre left side.....
With a good torch and a thin screwdriver, turn the disc until you have the sight hole just past the 12 oclock position with the hole towards the front of the car. This allows for use on either wheel side....
With the torch, look carefully inside the hole. Take your time and you will see the adjuster. Its like a gear cog with rounded edges, a spring along the bottom edge. With the screwdriver, carefully flick the adjuster round until it cannot move any further. This will be when the shoes are all the way in or, sadly, all the way out. If the latter, turn the adjuster all the way in the other direction. Most times its done by feel only as you will find it hard to do and look and hold the torch at the same time.
Alternate method is to hammer the hub carefully off (if being replaced) by carefull hits all the way round the disc at alternate times to free it. You will probably rip the lining off the shoes (replace with non VX as they are cheaper and not as essential for genuine as the actual pads and discs) as well as probably pulling the steady pins out the backing plate. If the pins pull out you create further work for yourself (and costs) by tring to repair it.
I suggest persevere with the adjuster route first. Its a pain to do but ultimately, an easier task in the long run...
HtH
B