BMW E36 - Replace Spark Plugs or Ignition Coils

Worn Spark Plugs or damaged Ignition Coils can cause serious problems. If your local mechanic quoted you for a very high amount and you've decided to try to do it yourself, you've come to the perfect place! Hopefully we can get through this.
Done on an M50B25TU from an E36 325is, but should be the same processes on most models.
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