Grab

Kenalog vial — Kenalog-40 (40 mg/mL) or Kenalog-10 (10 mg/mL) — see table below
Diluent if mixing: 1% plain lidocaine or sterile saline (use whichever the doctor asks for — if not stated, ask)
1 mL syringe (Luer-lock)
18-gauge needle — for drawing up only
30-gauge needle — for injecting
Alcohol swabs
Gauze
Tape or a label to mark the syringe

Mixing table — what the doctor asks for → what you draw

All rows make 1 mL total. Need 2 mL? Double everything.

Doctor wants	Start with	Draw
40 mg/mL	Kenalog-40	1 mL Kenalog-40 — no dilution
20 mg/mL	Kenalog-40	0.5 mL Kenalog-40 + 0.5 mL diluent
10 mg/mL	Kenalog-10	1 mL Kenalog-10 — no dilution
5 mg/mL	Kenalog-10	0.5 mL Kenalog-10 + 0.5 mL diluent

Never mix Kenalog-40 and Kenalog-10 together to hit a number. Half-and-half of the two vials makes 25 mg/mL — not 20. Dilute with lidocaine or saline only.

Steps

Confirm the strength with the doctor before you draw anything. If you're not 100% sure what was asked for, ask again.
Shake the vial well. Kenalog is a milky suspension — the medicine settles to the bottom. It should look uniformly milky white after shaking.
Look at it. If you see clumps, flakes, or a grainy look that shaking won't smooth out, don't use it — show the doctor and get a fresh vial.
Wipe the vial top(s) with an alcohol swab.
Put the 18-gauge needle on the syringe (big opening = easy to draw a thick liquid).
Pull the plunger back to the amount you're going to draw, stick the vial, and push that air into the vial. Then flip the vial upside down and draw your Kenalog slowly to the line.
If diluting: draw the Kenalog first, then draw the lidocaine/saline into the same syringe up to the total. Rock the syringe back and forth a few times to mix — it should look evenly milky.
Tap the syringe so bubbles rise, push the air out.
Swap the 18-gauge for the 30-gauge. The small needle hurts much less. 18-gauge goes straight into the sharps bin.
Label the syringe with the concentration (e.g., "K-10" or "20 mg/mL") — tape flag on the barrel.
If the syringe sits for more than a couple of minutes, the Kenalog settles inside it too — rock it again right before handing it over.

Watch out

Wrong concentration — this is the big one. Confirm before drawing, label every syringe, and never guess.
Handing the syringe over with the 18-gauge still on it.
Kenalog that sat and settled — always re-mix (vial and syringe).
A clumpy or grainy vial — usually means it got frozen or overheated. Don't use it.
Unlabeled syringe left on the counter = it goes in the trash. Nobody injects a mystery syringe.