Wow, everyone, there's been great points made here, emotions are running high and defensiveness is obvious. It's natural, though. The questions below are merely suggestions and thought-provoking, however, they are realistic. Researching costs of everything is a good idea and having goals and a plan is a great idea, however, experience cannot be replaced with estimations. Do not think I'm trying to dissuade anyone from moving in together, marrying, or getting out on their own...I'm only looking at this as realistically as I possibly can.
Remember that change is inevitable - whether it be your own selves or your living arrangements, school, the economy, likes/dislikes, wants/needs, etc. - and learn to grow together, be friends, be lovers, and be partners. You both must work together and make sure that you communicate well. I'm sure, since you have been together for a significant amount of time, that you've got this covered, but it never hurts to improve an important requirement for a successful relationship. If I seem to be preaching, I'm not - only emphasizing so that your relationship will be successful - successful ones are becoming quite rare.
Prepare the best ways you know how, discuss with eachother what options you would consider using if, for example, one of you was forced to stop working due to a sudden illness or impairment (A sprained ankle can take weeks to heal, crutches are a pain in the a -- uh, armpits, travel is harder, etc). These things
do happen, as well as flat tires, car accidents, etc. What would you cut within the household expenses in order to make sure the necessary ones are paid (rent, mortgage, electricity, gas, food)?
Is the cost of your ideal place of residence within your sole income? If not, how much money would be deducted from the other person's income? Will you keep your money individually or pool it together? If individually, discuss an exchange to balance the income/cost of living ratio between both of you. Will your home have a washer/dryer or will you use a laundry mat? Using a laundry mat costs money - how often do you do laundry in a month? Do you want credit cards or already have them? How will you handle your cost of living if one of you overspends and cannot pay a bill? How much can you save each month for vacations?
You've got two years, build on it, it's plenty of time.
In 1 1/2 years, 6 months before the time you both will be moving in together or getting married, see what your income and bills are then. Till then, save up as much as you can, learn to live well within your means, communicate and enjoy being in love.
