1993 Ford Aerostar changing the spark plugs

What tips or shortcuts are there? I have plenty of regular tools, but from looking at where they are, I proably need to pull the front tires and the doghouse cover. Any tips would be appreciated. According to owner (church lady I'm trying to help out) it's NEVER had a tune up! Will plugs be welded in? It's starting to not stay running after it warms up, meaning it starts and drives fine for the first leg of the trip, but after trying to start again, it starts and dies. Multiple attempts results in it finally starting, but sometimes takes 10-15 minutes of try then wait. Runs fine once it stays lit. I've had to rescue her twice, and with winter coming on, I don't want this older lady stranded.