Stupid question but how much Japanese do I need to know to play a Dragon Quest game?

Hi,

I know kana (both hira and kata) and I know some kanji. I'm half way through RTK1, just ordered Genki 1 with Workbook AND  Assimil's Japanese With Ease to fill in blanks.

My goal learning Japanese was so I could play Dragon Quest games. I want to go beyond that of course, but being able to play and understand a DQ game would be amazing. Given they're aimed for all ages, what can I expect in terms of language barrier?

For the record here's some pics of the average DQ game:





Yeah, I am embarrassed that the reason I started learning a language is to play a game series, but it's how I feel.

These games have furigana sometimes but still. I plan on getting Genki II, Guided Readers, participating in Lang-8, and practicing speaking Japanese with my friend who is fluent (she's helping me), and read manga like Yotsubato as I progress. But in my mind, I'm hoping I'll be able to play a DQ game in Japanese in two years so I can play 11 when it comes out. The problem is I feel like I'm probably underestimating the language? What can I expect and does my plan seem reasonable?