I keep reading that post-facelift swelling can last up to a year! Where is this swelling? Is it noticeable?

Your question is general in nature. Can swelling last for a year- yes. Most swelling is gone by 6 months after surgery. 
It is impossible to address your questions without seeing how you actually look like and what what you want improved. The real answer to your question is based on what you look like now and what you want to look like going forward. I have had patients singing at a wedding, 2-weeks after her surgery. 
Look at the weblink and the video attached. It will help you with your educational process. 
Sincerely,
Dr K 

Everyone heals differently, however most of the swelling will resolve after a couple of weeks. There will be residual swelling that can take several months to be completely be gone, but it will not be noticeable to others and probably not even you. Be sure to keep your head elevated after surgery, sleep with a couple of pillows under your head and avoid doing anything strenuous for 4 to 6 weeks after surgery or swelling may return. Be sure to consult with a board certified plastic surgeon and view many before and after pictures. Good luck.