30,000 mile tuneup

Hello, need help Please. The van is suppose to have a tuneup every 30,000 miles. Last time it was tuneup, I have it done at a garage and it cost me $799.00 (I feel like I got took, but it was too late to do anything then). Anyway I am a senior on Social Security and I only receive $1,350.00 month. This time I am going to try and do it myself, but I have the following problem. In the photo’s below there is a electric part that I need to move aside to get to the number number one spark plug (photo). Can you tell me what this electric part is and how to move it aside so that I can get to the number one spark plug and spark plug wire? Thank you, will be waiting to hear back from you.