我对您的要求，凡我能做到的，从来我都会尽最大努力，而且不讨价还价。这是我对朋友的一贯做法。怎么翻译

I always try as best as I can to satisfy your requirement if I can make it and never bargain. This is my usual practice for my friends.
as best as one can 尽最大努力
the usual practice 惯常的做法

As for your requirement, I will try my best to satisfy it if I can make it. I don't like bargaining. That's what I usually do to my friends.

我把上面修改一下
I will try my best to satisfy your requirement if i can,and never bargin.that's the way i do for my friend.

I always do my best to sacrifice your demands with no bargaining,and i do so to all of my friends.