You can certainly get invites just doing basic gear, shadows, and vokes, but that's not going to make much of an impression and, like every other job, could mean getting looked over for invites when there is competition LFG. I put a lot of parties together and I know I keep a mental note (sometimes written in extreme cases) of players that do the bare minimal and players that excel and it plays into getting invited again (on any job) when I see you seeking later.
If you want to do the job right, you better be prepared to stop and farm pretty often if you're not already sitting on a small fortune or have said gear from other jobs. Aside from the Katanas, I already have all of the expensive gear that Wolffhardt listed out and then some and I won't touch the job because I know I'd feel like a crappy NIN if I didn't do the wheel and am not about to fork over the gil for that at the moment as I'd rather continue to invest that gil into pieces I can use for multiple jobs or that I can turn around and sell later and circle back to NIN when I have the excess cash to drop on consumables.
If it makes you feel better the wheel is only great for exp burn chaining from like 40-50, dragged to 55 maybe. The atk/haste gear is the real kicker. Don't let your ninja dreams be dreams.