How my right pinky suffered when I first started out with Dvorak!  My pinky had never had to really do anything before that,  so it struggled.

Double burden to begin with, as you'll be correcting more errors most likely - putting more pressure on it.  You might be able to find a tutor that doesn't make you go back and correct errors, to give you a brief respite.

I know it was a real issue for me, it's what caused me to eek out this forum in the first place.

Also Q and Z are quite rarely used so your pinkie's used to just stay in place and press A. For Shift and Ctrl you usually move your whole palm (I assume?). Now you introduce the stretching for Backspace which is new for your pinkie. It should get better as it gets stronger and gets used to the lateral stretching.

If you're up for it you could do like me – use both backspaces depending on the preceding/following letters. In some cases it's more comfortable to use the original position of BS than the new one. But that's personal preference and if it makes you more confused (since you already learn the layout itself) then maybe you can wait till you're comfortable with all keys' position and don't have to think which is where.

In case anyone was curious on an update, I've since adapted and have gotten use to the extra stress on the left pinky. This is probably due to a combination of having gotten used to Colemak (and hence using Backspace less) and the pinky just getting stronger.

I've also moved the Bacspace key to the Tab position, and have put Control/Escape  on Capslock instead (I'm a vim guy, though I also like the closer proximity of Ctrl for browser shortcuts). I then moved the Tab key to Esc position.