No problem!
You can save after every battle pretty much. As soon as you finish a battle/stage, it takes you back to the castle where you can heal up, buy weapons/armor/items, visit the item world, go to the assembly to create new characters and other stuff and to save the game as well.
So ya, Disgaea is a series that saving points are plentiful and you dont have to worry about long battles, at the most each battle/stage should take you around 5-10 minutes if you know what you are doing.
I make multiple saves just in case if I accidentally kill a ally character (this affects the ending).
Hope you enjoy Disgaea PC - its an awesome game , I finished the PS2 version and played a little bit of the PSP and DS versions - and currently playing the PC version - have to say its the best version since it has all the content from the PS2, PSP and DS versions all combined with PC exclusive features like the textures and the UI.
Disgaea 1 is one of my favorite games and the series is one of my favorites.
I beaten Disgaea 2 on PSP few years back and havent gotten the PC version yet but I plan to do so in the future.
I also bought Disgaea 3, 4 and D2 recently on PS3, planning to play them soon and hopefully double dip again when they come out on PC .
That sounds awesome man! Can't wait to check it out. How many hours can I expect to clock in D1 seeing as how it'll be my first Disgaea game, and including the post game content? By the way is there an "End" to the post game content? Or does it pretty much go on forever?