Depending on the year, from the early 90's on they are extremely difficult due to the Passkey system GM started using (keys with resistor chips in them) that makes it difficult to steal by requiring the properly coded key to be inserted before the engine will start. For most vehicles you need to start by removing the cover on the steering column. Sorry I cannot be of more help.
Take it to a shop
You can remove the 1999 Cadillac Deville ignition switch by removing the retaining ring. The retaining ring will be at the top of the ignition switch. Pull the ignition switch out. Remove the wiring harness from the back of the switch. Reverse the process to install the new switch.
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You
rear speakers
7 quarts without filter change 7.5 quarts with filter change.