I learned a 2 handed in the 1980s as a Junior, as that was the thing then. I would say I am an intermediate player. My 2 handed has some problems, I have worked on it but it is still defensive, and seems unreliable and easily unless I keep playing. Many times I have had to switch to the one handed slice since I cant rely on the stroke in key matches. My main goal is to get a more reliable and hopefully weaponized backhand. I tried hitting a few 1 handed backhands, and it seemed "interesting", more powerful and definiately different. I wonder how long and difficult would it be to switch? Because of course I am limited in time (no longer a Junior). Are we talking months or years to get at the same level?