"It will be a small affair," a source close to Aniston tells PEOPLE in this week's cover story

She conquered the Oscars, and now Jennifer Aniston is preparing for another very big day.

The actress, 44, is in the process of planning her wedding to screenwriter-actor Justin Theroux, 41 – and she has already checked off some major tasks on her to-do list, including choosing wedding bands, setting a date and narrowing down dresses.

Just don’t expect the wedding, which is likely to take place soon after Aniston wraps her current film in Connecticut on March 8, to be a lavish production.

“It will be a small affair with their closest friends,” a source close to Aniston tells PEOPLE in this week’s cover story.

In the meantime, the bride-to-be is enjoying life with her future groom.

“Jen seems more confident than ever,” says the source, “and they’ve become a great team.”

For much more on Aniston and Theroux’s wedding plans, their romantic Oscar night and look inside their relationship, pick up this week’s issue of PEOPLE