Need help changing spark plugs Options

[CelicaGT]

I just bought a celi and i want to change the spark plugs but both me and my father were both stumped on how to get the spark plugs out. i know it sounds like a dumb question but they seem to sit kinda far into the head. well whats the best way to get them out. do i use an extension on the rachet or do i have to remove something else to get closer to the spark plugs? Also i have a gt with 100,000 miles on it. Is it ok to start running mobil 1 synthetic motor oil. the car runs strong and was well maintained. What do u guys think?

[brandtlj]

I just purchaced a new set of iridium spark plugs and want to install them myself, but I've found that I'm missing the 5/8 inch spark plug socket. My mechanic quoted me 30-40 bucks to do the job, but I feel that would be a waste of money and I'd feel like an idiot for not doing it myself. Also, I believe that the spark plugs need to be torqued to some specification but I don't really feel like buying two $25 tools just to use once (iridium spark plugs are good for like 100,000 miles). Anyway, any suggestions on what to do? I don't have any friends that have these tools, so thats out of the mix.

BTW-about the oil question; I take it that a synthetic blend would be a good step before using pure synthetic oil during an oil change...or does that not even matter? But I've also heard that converting from organic to synthetic oil on a high mileage engine might cause some trouble with the thinner sythetic oil seaping through the engine seals. Is there any truth to that?