Well the GtkRadiant program is blowing my mind.
I know, right? I just finished my first map and I gotta say, wow, what a process.
knowing some fundementals makes all the difference. my only previous experience was with UnrealED 3.0 and from my perspective GtkRadiant 1.5.0 rocks. very easy to get used to, you just have to get used to it.
keep at it, its a lot of fun. my next map will be even better!