Belfast to Scotland

I haven't personally made this journey, but you can plan your own by using this site, Traveline Scotland:

http://www.travelinescotland.com/welcome.do

Click on "Plan Your Journey" at the left of the home page. Don't worry; even though the site is named Traveline Scotland, it will allow you to plan a route in Belfast. You didn't say whether your starting point is Belfast City Airport or Belfast International Airport. You can check your airport's site for "to and from the airport" information about
ground transportation to Belfast Europa Buscentre. (You don't really have to walk, as Traveline suggests.) From Belfast Europa Buscentre you can take the bus to Belfast Port and Belfast Stenaline Ferry Terminal. The ferry goes to Stranraer, Scotland.

Thank you!