There are basically three kind of "eye" days for me now that I am an experienced, savvy contact wearer.
The first kind of "eye" day is one without contacts. There is absolutely no hassle getting the little miracles in because they stay, hydrated, calm and peaceful in their cases. The slight downside to a no contact day is, of course, glasses for various types of eye work must be worn (reading glasses, far away or close in glasses, magnifying glasses, whatever).
The second kind of "eye" day is the not so perfect fit or feel contact day. In this instance, the contacts are put in with or without some trials (but the trials are independent of the way the eye and contact battle through the day). Once the contact are in, the unknown source of irritation begins, sometimes causing the wearer (moi, just in case you were wondering) some increased amount of blinking, eye rubbing (which may cause more irritation, not sure), use of eye solution (of course, no eye drops, which react badly with contacts - a little antithetical if you ask me)

and some times a trip to take the consarned (actual word) things out and try to put them in better or in a more comfortable state (which almost never works, at least for me). Sometimes, as the day wears on, the nerves in the eye (if there are any) give up, decide to give the contact wearer (again, me) a break and stop firing their pain signals to the brain. This break can be anywhere from an hour after getting to work in the morning to right as I am about to go to bed (ah, perfect feel, now, I need to take them out). Of course, this kind of a contact day is not the end of the world, just as having sand in your eye is not the end of the world. Still, there are more enjoyable things than sand in your eye (I'm just sayin').
The third and best kind of a contact day is when the contacts, once applied, become one with your eye and you see clearly, with no watering, no pain, no . . . basically, you forget you are wearing them, until you go to bed and think "I should really take my contacts out". I had one of those days today (and, really, yesterday). They make the hard, pioneer like suffering days a lot easier to get through, because there is always hope that tomorrow, everything will be perfect.
Have a good one, KipK