I did my own plugs around 70K if I remember. One key obviously is to take off the engine cover and also remove the heat shields on the side of the engine, that allows easier access.
Having said that, it's not as easy to get them all out as on other vehicles, particularly those 4 closest to the firewall as the angle is a bit awkward and you have to be careful not to bend the unit....however, with patience and gentle coaxing, it can be done. It took me about 2 hours to do them all...but I was being cautious not to break anything.
Probably easier to get your local independent shop to do it in my opinion for the next time around.
cheers.