Welcome to the forum, prepare to be educated and entertained. I too have '77 550 which is now running fine because of this site and all the fine folks. Cleaning carbs is not difficult if you take enough time to be very careful and learn first what the parts are and how to label them. It sounds like you might need to clean them to get the bike running well. Don't be too quick to run out and buy rebuild kits, I've gotten three engines to run well and the only parts I had to buy were a few o-rings, spark plugs, and a set of idle jets I ruined, because I acted first, and read the forum later.
Oh...and take pictures so you know what it looked like "before". That's easier than asking for a picture to see where "that thing" is supposed to be. (don't ask how I know this)
And by all means, have fun...it's supposed to be a fun hobby.