Coolant Leak Issue, Need Help

So I was finally able to do some checking on this... the past couple months have been pretty busy.

So i was able to clean the engine bay up pretty good and took it out and then parked it for a bit. The areas I noticed it coming from was a freeze plug in the front of the starter, the freeze plug above the left engine mount, and around the upper part of the timing cover. So there is not much I can do about the freeze plugs besides change them, so I may do that in the fall/winter. As for the cover I will try and retorque the bolts and see if that helps.

How difficult is it to change freeze plugs?

I also noticed some engine oil dripping from the trans dust cover, so that tells me the rear main seal could use some attention. How difficult is it to change the rear main with the engine still in a vehicle?

After reading this again a couple people did say water pump, but I did not look closely enough at that. I will try and do that this week to see if that is also an issue.