Sorry, it's taken some time for me to reply. I needed some emotional distance from this topic for a while so I could calm down and when I had and was feeling more capable of handling it, I needed to prepare for Christmas and Christmas related travel instead. I do really appreciate the responses. Thanks for your kind words, reassurances, understanding and advice. I think I might make the effort to come back here and read these forums more regularly. I like how they deepen my undersandings and change how I view the world. Take care everyone, and hopefully I will see you around here again :-)
Lilacwoman – I thought I did see her as a woman and was surprised to realise I didn't all the time. My mind kept swapping back to old ways of seeing and thinking about her. I'm still adjusting it seems. I've known other transgender people and never had a problem seeing them as their proper gender or referring to them with the correct pronouns but I also didn't know them before they transitioned. I'll get there eventually, I just wish there was a way I could speed up the process so I don't hurt my friend again.
Jayr – "punched in the face" is seems like an accurate description of how she looked every time I blundered. That or stabbed in the chest. She even flinched. I can understand why you would want to smack them in the back of the head. Despite how much distress I was causing my friend, she actually ended up comforting me.
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Redacted] – thanks for sharing your friend's method. It's great that he has managed to use the correct pronouns every time and he has been so supportive of you. I also think it's fantastic that he was up front about it being difficult to make the "mental switch". It makes me think that maybe I should speak to my friend about it. I intended to speak more deliberately but I have a medical illness that impairs my cognitive functioning with fluctuating severity and wasn't able to do it. I positive I will make the mental switch eventually.
PS I checked out your blog. Wow! You're a really gifted writer. I became emotional while reading it. I think how I understand myself, others and the world evolved a little more from reading it so thanks for giving me that glimpse of that part of you and your life. Are you planning to post anymore entries? I feel invested in you and your happiness and well-being now and want to know how things are working out for you. Are you feeling aligned inside and out now? Have you found someone? etc
MsDazzler – thanks for welcoming my "contribution" and for your reassurance. I was really distressed over what had happened (I hate to think what my firend has been through over the last couple of weeks - I really should write to her and check). It's hard being responsible for hurting a friend even when it is unintentional. It's especially hard to know you're probably going to do it again despite your best efforts. I am fretting less now though and that's a good thing because being anxious about it will make me anxious around her and will mean I'm more likely to make a mistake.
Beverley – It's good to know that I'm not the only one and we're all fallible

She's definitely worth it

, I just hope she feels the same way about me and will keep me asa friend despite the blunders I'm bound to make while I transition. I agree with you – practice does seem to be the key or at least one of the keys. I've started writing descriptions/ stories about my friend underneath a recent photo of her so I can practice using female pronouns when referring to her. I'm hoping it will become automatic for me that way.
PS If anyone replies, I'm going to be away for the next week and a half and will only have a limited and unreliable internet connection so may not be able to get back to you until I come home.