Head Liner replacement

How hard is it to replace the headliner in a 68 Valiant? I have the support rods. Just not sure if I should try and tackle it.

If you do it yourself I recommend buy the headliner from Legendary interiors. I bought a made in "usa" headliner for $65 on line and spent way too much time installing it. Only to take it back out and then buy one from legendary. It fit 10x better and went a lot smoother. It was also nearly 3x the price. If you can get someone to do for 2 or 3 hundred dollars then have them do it. Just my opinion. I have done 3 of them and they are a pita!