I've always 'jacked' the front of my D110 up... with a lot of precautions and forethought put in place. I try to anticipate 'what could possibly go wrong' and mitigate the circumstances, especially as I work alone. Always work on a dry, level surface and carry your mobile (cell) phone with you. If there's someone else around, have them there as a 'safety' person.
Seeing as I have a FEL on the 4105, typically with bale spikes with a roll-back frame, I lift & then lower the spikes so that the frame is extended horizontal. I drive the front of the D110 up to just in front of the edge of the frame, set the brake and then, using rope, tie both sides of the front axle to the edge of the frame. (as I'm retired Navy, I know my knots

) I then slowly lift the the front of the D110 up to the height that I want it at.
Then I place a number of pallets (4-5) under the front wheels of the D110, chock the back wheels (split firewood works for me), and then slowly lower the FEL so that the wheels are resting on the pallets yet there is still a bit of tension on the rope(s).
I can now access the bottom of the mower deck to remove the blades. My Owner Manual suggested using a 1.5' length of 2x4 to brace the blade(s) from moving as you take them off/on and it really does work, as opposed to trying to hang on to the blade with one hand as you ratchet the nut.
Remember the orientation of the blades and which side of the blades face down for when you put them back on.
After sharpening the blades, I then reverse the procedure for setting the D110 back down and securing the 4105's FEL.
Take your time. If this is the first time you've taken the blades off, make a note in your Owner Manual (blade removal section) of what size socket is required.