This may work for you.

First, unhide the cells.

Then highlight the whole sheet. Now select formatcellsprotection and
uncheck the box that says "lock cells"

Now highlight only the cells you want to protect follow the same path and
check the box for the cells you want.

With that done, select toolsprotectionprotect sheet.
In the box that come up there are several options on how to allow or prevent
others from performing certain tasks. With that done enter a simple password
that you are sure you won't forget and enter it in the "password to unprotect
sheet" box. I think you get another box asking you if you are sure and to
retype your password.

CAUTION: if you forget your password there is no way to retrieve it.

Neil M