Well David... you have gotten quite a bit of good advise here...
Let me add to...
As far as the agent thing goes... it depends on how much research you want to do. That is what agents are for. They do all the leg work for you... plus they have the optional
trip insurance to cover any thing that might go wrong. (not that it will!) It is good to have someone on your side!
If you have the time... planning your own trip can be fun!
Timing: The first two weeks of Dec. are the best time to go. Crowds are non-exsistent and you get to see the holiday stuff!
Lodging: Monorail is the best place for toddlers! Realise that they are also more $$$... but worth it with 2.5 years olds!
If you want the easiest... then stay in the Contemporary tower rooms. Less walking to the monorail. Polynesian, Grand Floridian (GF) & The reast of Contemporary have a long walk to the tracks.
My favorite though is Wilderness Lodge (WL) It is beautiful and has direct boat to MK. But it is not on the monorail. Buses will transport you else where. But the place is very friendly to Adults and kids alike! Plus more $$ resonable.!!!
Park Planning?? Decide early on if this is a trip for you... or your kids. If for just the kids... leave EPCOT out... Concentrate on AK & MK. They are too young to enjoy. But YOU will love it!
Ideas: Here are my suggestions for an easy time...
Character meals: Book a priority seating (PS) at the princess breakfast at EPCOT's Norway pavillion. around 9:30ish. By the time you finish with breakfast... you will be in World SHowcase (WS) when it opens! Pleanty of time tobrwse, and see with no crowds! Then head to future World (FW). You will pass all the crowds heading to WS! Want a great way to have quiet time with the Mouse? Book a 3:: PS for EPCOT's the Garden Grille's Ice Cream Social. Chip & Dale are also there... No pushing kids for autographs... just you and the mouse!
If youthink you will be hungry... they also have lunch and dinner ehere.
The Contemporary has a great breakfast with Mickey, Minnie & friends. This is a great start to a day... The earlier the better (less wait time)
This is also a great place to watch the fireworks at night. On the roof! Far enough away not to SCARE 2.5 year olds... and close enough to bed... so they won't be cranky in the morn.
Have lunch at the Rain forest cafe. Join it's Safari Club (worth the $15.00 for PS & Coupon) Decide if you want to spend time at Downtown Disney (Remember... You & Kids can go to LegoLand while Momma shops!!!) The restaurant is there... OR you can have lunch at AK! It is a neat place withMANY MANY things for a 2.5 year old to look at! (note: there is a pretend thunderstorm)
Well... that is a start... I have been in the travel industry for 12 years... And I worked for a Disney Wholesaler for 5 years. I LOVE WDW with all my heart... and like to see families enjoy them selves. If you have any additional questions... I would be happy to help. There are SOOOO many things to do at WDW that do not require entrance to the park... and are age appropriate for your kids.
Remember to browse the sites the others have listed... they are a wealth of info!
GOOD LUCK!