I have not done much actual teaching of letters so far with T and W. T is not at all interested in workbooks and I think he is the type of learner who will 'get' it in his own time. Mostly we do a lot of reading together and both boys try to identify what sound different words start with. W has more success with this.
I plan to get some shaving cream to make letters on a mirror.
T can write his name with a bit of help. Being left handed he often writes from right to left.