Getting the back open is easy and nothing to worry about if done correctly.

1) Stick fingernail in thumb slot and loosen
2) Move thumbnail to other side of that end with the thumb slot and loosen that side of the end.
3) Start on one side near end and loosen with thumbnail
4) Go to other side and loosen with thumbnail.
5) Walk down the sides loosening as you go along.

No drama or worries when done this way. You can also use something like a rounded nail file to slip under edge.

If you just pry it completely off from the nail slot I can see how it would worry you.

Finesse is your friend here.