Ya'll could do the same as Streetfighter did even though ya'll have the dipstick, doing it his way will insure you get all the old fluid out, simply draining it out of the pan will not remove all the old fluid only 1/4 to 1/3 if you're lucky.

That being said checking the fluid level once you get most of the fluid exchanged will be much easier for ya'll since you can check the level with the dipstick, so I would avoid overfilling by a quart or half quart and just add more via the dipstick tube to get the level correct, otherwise you will have to pull the drain plug to drain any excess fluid and that could get a bit messy and you would be just guessing before trying to put the plug back in before you drain too much out and you will have fluid running down your hand and arm while putting the plug back in.