CD/DVD drive stopped reading all CDs and DVDs

I’m having a problem with the CD/DVD drive of my laptop (Toshiba satellite L100). It has stopped reading all CDs and DVDs, and disappeared from my computer and device manager. I have figured out the problem, the drive has become loose and I have to reinsert it.
How will I be able to do that without asking for a technician’s help?
I know nothing about stuffs like this (esp opening a laptop) so please give me an easy-to-follow guide.

I’m not familiar with this particular Toshiba model but most likely you’ll have to remove one screw from the bottom of the laptop and then push the CD/DVD drive from the laptop.

If your CD/DVD drive disappeared from My Computer but you still can see it in the device manager, you can use this method posted on Microsoft site:

To resolve this problem, remove the affected filter drivers. To do this, follow these steps:
1. Click StartStart button, type regedit in the Start Search box, and then click regedit in the Programs list.

User Account Control permission If you are prompted for an administrator password or confirmation, type your password, or click Continue.
2. Locate, and then click the following registry subkey:
Caution There can be many instances of the registry subkey that is mentioned in step 2. You must make sure that you are in the appropriate registry subkey before modifying the UpperFilters and the LowerFilters values. To verify that you are in the appropriate registry subkey, make sure that the Default data value is DVD/CD-ROM and the Class data value is CDROM.
3. In the right pane, right-click UpperFilters, and then click Delete.
4. Click Yes to confirm the removal of the UpperFilters registry entry.
5. In the right pane, right-click LowerFilters, and then click Delete.
6. Click Yes to confirm the removal of the LowerFilters registry entry.
7. Exit Registry Editor, and then restart the computer.