I don't have keyless entry so I have to manually unlock/lock my door and when I unlock the driver side door or lock it, it only works for the driver side door. It doesn't unlock the trunk/passenger/etc... nor does it lock it, so if someone is in my car with me I have to have them manually lock it when we leave my car in order for it to lock? I heard it could be the ?? Door Lock Actuator ?? or something like that? Is this a DIY fix? Also is there anyway to avoid this step and just jump to getting a keyless alarm? Will they be able to install it and have the keyless work correctly? Thanks for the help in advance

yes - door lock actuator usually
Can be, there are writeups, I've seen many folks screw it up though
NO, that actuator moves your door lock, no actuator, no automatic movement
Yes - but it depends who "they" are

Would you personally fix it yourself or take it to a shop to have it done? Thanks for the help

I work for a shop. So the answer is both.

In your case, I don't know what you have done/are capable and comfortable with doing. The actuator isn't too hard, but installing a keyless entry/alarm can be. If you have time, electrical and mechanical knowledge (a lot of all three), and don't mind doing it - go for it.

Well if I fix the actuator myself I was gonna have a shop do my alarm. In terms of difficulty how hard is the actuator?

"two wrenches"