Dan - SLDL is kinda oddly named.
your legs are stiff, but not locked out at the knee if that makes sense.
best way I try to describe it (in words instead of showing) is...
feet LESS THAN shoulder width apart.
Hands on the bar so they are just outside your legs.
in a standing position, unlock the knees so you have a tiny bend in the leg. At this point, this is where the legs stay stiff.
Your back should be arched (picture sticking your arse out and chest out at the same time)
from there, you bend forward and arse goes back a little as you lower the bar down to about shin level (if you are doing it right, it will feel like your shorts are slipping down your arse.
and you will feel the stretch at your hammies..
since you are a desk jockey, you will have very little felxibility in the hammies and butt.
and when doing it right, you will not be able to lower the bar to the floor.
Do it slow and steady.
keep the bar close or against the shins.
Dani Boi - he wants a "balanced" routine.
saying he doesn't need to do Squats and/or deadlifts is stupid.
Squats, bench, deadlift, OH press, chins and curls (if you want) is pretty much perfectly balanced.
Keep at it Dan.
The Pendlay Rows are also an odd feeling to start with.
But keep at it.