Headliner install

I do them professionaly all the time. I also get to redo owner failed attempts alot.
If you don't have the funds to get it done you will have to have a go at it.
If you take your time and really pay attention to what is going on and how the materials you are working with react and are meant to be used you can have good results.
I will say as a warning, I couldn't begin to tell you how many guys come back wanting me to fix
their headliner saying no matter what the cost it would have been worth it. Convertible tops the same thing.
I have been doing this work for over 30 years and to do them right it takes me about 5 hours to make them perfect. Expect it to take a first timer much longer. Some are easier than others. A lot depends on the quality of the material as to how difficult the job will be.
I have tryed to teach employees the skills needed for decades and not one has taken to it or could do a professional job I could sell.
You have to look at it like this. If someone else can do it their can be no reason I wont be able to do it also. If you don't have that mentality and alot of patience your best getting experienced help.
I believe you either have it or you don't. Can't be scared or you are already beat.

Take the glass out that's part of the job. Center the bows in the headliner and don't cut the listings no more than necessary.
Strech front to back first. Be very careful when locating screws thru fabric. If you work it right you won't need a heat gun and I don't recommend them as they can melt the grain in the vinyl fabric. The wrinkles from being folded up in the box will work them selves out on a hot day. Steam is a safer way if you Dont want to wait for a hot day.
I learned to do this work for the very same reason you are doing yours now. I couldn't afford
to pay the labor. Being desperate is to your advantage in this case it forces you to take the challenge on yourself. Many guys I have met learn the difference between being broke or being cheap on a project like this. Hope this helps you end up with good results with your Mopar.
It is a hard thing to teach on a page like this but if you have any questions just shoot me a pm.