Decided to play on easy and just try to have a dynasty that play from 800 to 1400 was pretty sucessful and fun so far, though I am defintively still learning. I'll probably repeat the experiment again once I can make a custom ruler.
Started as a count in France one and 300 years later I am one of the most powerful duke of the empire ( I presume I could have actually made a play for the throne of France a while ago, but, the oppotunity hasn't quite show up aand I actually kind of like building my forces and not focusing on it).
Mm current ruler's father was pretty formidable steward as it allowed me to swallow an entire duchy in his lifetime, suprisingly he only had one son before his ascension, that was until I had him marry a second time in his 50's to an Adamite Ethiopian and even though she initially hated his guts cause of incompatible culture (because of how powerful the bizantine empire there's a few member that are orthodox greek in the main line, though they are moving back toward being catholic french, but I defintively grabbed a piece of Italy and Anatolia for my relatives when a few pieces splintered off). the second wife kept getting pregnant, so tons of its of what he acquired ended up getting sent to his half-brothers when he died. While his heir started off really mediocre and basically only controlling 2 keeps directly (and for the first time folk inside the dynasty seemed to make a a play for his title) he should be as strong as his dad soon enough. Luckily what he controls make money like crazy, but supporting a competitive army is a challenge.
I had to get land again, my duch had almost all the counties of Orleans, but the last one is held by an acquitaine's vassal which defintiively is hard to attack and getting the king approval to attack is a massive hurdle up until now, since I managed to get a daughter married to him. So for a while I just grabbed onto piece of England, since they still haven't unified at all. Wales and France seem to be spitting it off, so that option look like it won't last, though his sucessor should have an easier time keeping what was acquired.
I dodged doing the crusade for a while, up until the computer finally succeded at one, though I basically still avoid the bulk of the fighting by just sending my guys fight in North Africa, while everyone else is fighing in the holy land.