Well, from the experience I had of a friend becoming my style guru, it's a bit of a mixed feeling. Unless you've spent most of your life obsessively studying how women act and dress, you may frequently find yourself thinking things like "um, what do I do here?", and this is where they can help effortlessly.
As for your personal clothing style, if you want to look the business there are some fundamentals, call them classics- they're useful. Maybe you can get through through this part on your own, but I did find it useful to have a couple of classy friends helping me.
I think it helps to be humble and grateful, and to recognise that these women, most of 'em at least, have been, er, women, for all their lives, and a bit of guidance is not a bad thing. Slowly you'll learn and find that you need them less. But hey, going to to shop, and interspersing it with a coffee, some chitchat, a few tapas - for me these are fun moments of my social life, even if they shake their heads and advise me against something. And that, no matter whether you're cis or trans, is half the reason you go out with a girlfriend in the first place!
Xxx
A/J