1993 Oldsmobile Cutlass Car just dies

Computer problem
1993 Oldsmobile Cutlass 6 cyl Front Wheel Drive Automatic 149k miles

Hey guys,
I have an old 93 olds cutlass sierra that actually runs really good with one small drawback as of late.

Sometimes for no reason the car will either miss for a few seconds then its fine for days or weeks and does it again and/or it will just turn off/die. This can happen at any speed even at a stop light. After it dies usually you can just re-start it again and be on your way for days or weeks and boom dies again. On the other hand it may be up to 15min before it will start sometimes and once again days or weeks before it happens again.

A friend of mine has the exact same car and was having the same exact problem and had the computer replaced and Im thinking thats my problem as well.

My question
Is this something I can replace on my own?
Is there a procedure I need to follow in order to do this?
Or is this something that a mechanic should do because of?

Any help would be greatly appreciated.
Thanks in advance