I had a hard time with this the first few days, even poked through the ear once.
Here's what works for me and Louie and a picture of how I hold her ear:
I never use the lancet device either. I just poke with the lancet directly.
-Do your testing somewhere where you have good light.
-I hold the cat on my lap, so she's laying down on my knees, butt facing me, head facing out.
-I rub the chosen ear for a minute or so...Louie like this and just lays there. I used to use heat but after a week or so, didn't need to use it anymore. Just rubbing works now.
-I poke on the back side (fur side) of the ear, as close to the outside edge as I can get without going into the bit of fur that hangs off the edge of the ear. You are only going to be about a millimeter from the skin edge of the ear. Just a lancets breadth from the edge.
-smear a little vaseline or ointment on both sides of the ear where you intend to poke then smooth it out and wipe off excess. This will help you see where the fur edge stops and skin begins and help the blood bead instead of running into the fur.
-I put a cotton ball inside the ear, and smooth the ear down around it, it should cup around the ball and I hold it inside the ear wth my left middle finger.
-I ge the cat and ear situated, before I poke, I put the strip in the monitor so it comes on and is ready to go and I don't have to fumble with it. Then I grab the lancet and do the poke.
-Don't stab at the ear from way above, hold the lancet almost on the ear before you give a quick little poke.I don't do the two little pokes, just one.
-You might not see the blood right away - just squeeze the ear a bit between your finger and thumb. Or use your lancet hand thumb or fingernail to scrape up the ear vein from bottom up and see if you can draw up some blood.
-If you don't see it after a few sexonds of this, do another poke. After squeezing on the ear, the blood should come quick on the second attempt.
-Once you do get a bead of blood, don't let go of the ear...put down the lancet, grab the monitor and touch the end to the blood drop...it should suck it right up. Don't use the strip by itself then put it in the monitor..you'll get an error because the monitor thinks you're putting in a used strip.