From what I've read about transhumanism as a general philosopy (i guess you'd call it) It appears to advocate both physical and mental improvement to the point where physical improvement should only really occur within the boundaries of the mental. From what I can gather, to progress and become better humans we should not only change our physical but also our mental, cultivating and retaining the best qualities of our nature so that we are kinder, more understanding/compassionate, better able to relate and interact with others etc. It is within these improved mental capacities therefore that we will be best able to make desicions about the technologies we chose to enhance our bodies with, how they should be distributed within the population and generally avoid the pitfalls such as inequality that are likely to arise.
If this is the case, then mental advancement should preceed physical in order that it is used properly. However it seems the possibilities of improving the physical body through technology are more realised than those that will improve our mental attributes.
Do we therefore wait until they have the technology to make us all more compassionate loving human beings capable of using the physical technology wisely? Do we undertake a process of improvement on our own without technological help and then decide when we are ready? Do we just leave the decisions and legislations up to someone else or finally do we just go ahead and improve our physicality and hope the mental follows? Or is none of this a consideration should we just all be free to change ourselves in whatever ways we think will make us better?