Have you made any sweaters yet? If you have and you are comfortable with all the techniques you need to create this garment (shaping sleeves and armholes, plackets for buttonholes, short rows, wrapping, finishing techniques, blocking, etc.) then go for it.
However, if this is one of the first garments you are making I might consider finding a simpler pattern.
I've never steeked before but it doesn't look too daunting!