I laid across the top of the engine, reached between firewall and engine . I would place all 3 plugs where you can reach them while laing on engine , If it has a plastic cover remove filler neck and cover relace filler .
I changed my spark plug and wires last year, and everything went just fine until I got to the last one on the firewall side! I had to buy extenders and all that. It was like the saying goes...always one! To top it off, the wire shredded and I had to drive on 5 cylinders for a few days until I got paid to get another part. Of course the check engine light and security lights were on. So next time I am going to take it too a shop and have them do it! lol I would recommend you do that, but who knows you may not have as much trouble as I!