@elduvelle I started with Open Office a few times and quickly quit again over small stuff. Then I found Libre Office and made a bet with myself: you use this thing for EVERYTHING for one month, and then you can see if you want to stay.
First thing I did was install some fonts I like (Myriad and Minion) and suddenly I felt at home. I write in German and English, so getting the right dictionaries installed took a bit of wrangling. I had to figure out how the formatting works (different from MS Office).
With Calc I was very quickly happy, as it wasn't constantly asking me if I knew what I was doing ;)
Been using it for at least 2 years for everything now, and sent off a donation just the other week.
For me it is a keeper!