Hi there!

It sounds like you're on the right track, but there might be a few things you need to double-check to make sure everything is locked and unlocked correctly.

Here's a step-by-step guide to locking all cells in a worksheet except for a select few:

1. Select all the cells in the worksheet by clicking the box in the top-left corner of the worksheet (above row 1 and to the left of column A).
2. Right-click on any of the selected cells and choose "Format Cells" from the menu.
3. In the "Format Cells" dialog box, go to the "Protection" tab and uncheck the "Locked" checkbox. Click "OK" to close the dialog box.
4. Select the cells you want to leave unlocked.
5. Right-click on the selected cells and choose "Format Cells" from the menu.
6. In the "Format Cells" dialog box, go to the "Protection" tab and make sure the "Locked" checkbox is checked. Click "OK" to close the dialog box.
7. Go to the "Review" tab in the ribbon and click "Protect Sheet".
8. In the "Protect Sheet" dialog box, check the "Select unlocked cells" checkbox and enter a password if desired. Click "OK" to close the dialog box.

Now, all cells in the worksheet should be locked except for the ones you selected to leave unlocked. If you find that some cells are still unlocked or locked when they shouldn't be, try repeating the steps above and double-checking that you've selected the correct cells to lock and unlock.