Can I do this on my own or do I need a pro with a larger Format?

[BKSinAZ]

I own a Nikon N90s with several nikon lens and a SB28 flash that mounts on top of the camera. I have been into photography for several years at a novice level, not a newbe.

My wife and I would like to have a large portrait done of us, approximatly 24 X 30, perhaps larger or what ever the standard size is close the that.

Anyhow, money is tight for my wife and I and we did not really want to go out and hire a portrait studio at this time. Will my camera do the job? Will the negatives that are shot in my camera enlarge to the size I require if I use a slower film or do I need to have a studio with a larger format do the pictures?

If my camera will do the job, which film/speed? I plan on doing this in my living room with a black sheet or something like that behind us.

I was thinking of one of two nikon lens. I have the 35-70 2.8 D or the 28mm 2.8 D lens. Not sure which will do the better job.

I also have a 3.2 mega pixel digital camera if it will do better with enlargements?

Any advise is welcome.