I know most people on here are old school and would probably say just Man Up you twat, but I'm a giant puss so I'm just writting this up to help other twats.

You can load multiple compounds into the same barrel.
You can pin subq daily into your buttcheeks for pain free and pip free injections. I have muscle tissue scaring from pinning my shoulders for 10+ years. Switched to subq and my bloods show no difference. Still gets absorbed.
If you pin Subq, You can buy 30G 1cc 1/2-Inch insulin syringes for about $15 for box of 100.
To draw, you want to buy a seperate box of 18g to 22g 3ml syringes.
I fill 7 insulin syringes every Sunday and store in my closet, havent had any crash on me. I havent gone past 7 days so I cant say how many you can prefill but 7 works for me.

Example Cycle
Test 300mg/ml and I want to run 630mg test per week.
Primo 150mg/ml and I want to run 400mg primo per week.
Mast 200mg/ml and I want to run 200mg mast per week.

Sunday would look like this.
Remove 7 insulin syringes and all the coverings.
Remove the stopper from the back so you can access the barrell to fill.
Test - Use your 3ml large gauge needle and draw 2.3ml of Test. 2.3ml is a tad extra, sometimes you lose a little as you fill.
Fill all 7 insulin syringes to the 30unit marker. Prop up the insulin syringe and lay it down at an angle so the oil doesnt leak out.
Primo - Use your 3ml needle to draw 2.8ml of Primo
Take the insulin syringe with test in it, and add 40 units of primo to each one bringing the total amount to 70 units of gear. Prop it back up
Mast - Use your 3ml needle to draw 1.2ml of Mast
Take the insulin syringe with the test and primo and fill them with 15units of Mast to each one bringing the total amount to 85 units of gear in each insulin syringe.
Re-Insert the stopper into the insulin syringe as you finish each one. Tip it back with the needle pointing up then give it a few flicks so the air bubbles rise to the top, then apply pressure to fully insert the stopper. Push the remaining air out until the oil meets the surface. Cap the needle and store room temp for the week.

Now you have 90mg of test, about 58mg of Primo, and about 28mg of mast in each insulin syringe ready for each day of the week.
When you inject subq, every now and then you might get a knot if you injected too quickly or a small bruise. It happens. It will heal.
I can pin my glutes for about 3-4 weeks before I give them a break rotating between left and right side. For the 1 week break ill pin the fat on my obliques or thighs if I can find any. Otherwise i'll do a week of IM into the thighs or lats. Then back to the glutes. If your body fat is above 15%, you can literally just pin anywhere on your butt cheeks theres so much fat there you have plenty of space and since the needle is so short you wont hit any nerves.
You can take a plastic zip lock bag, place your insulin syringe in the bag and zip it closed, and run the barrel under hot water in your sink if you want to heat the oil up for smoother injections.
Benefits of daily injections are noticeable, more stable levels, less side effects, less mood swings, less acne, less dips and upswings in energy.
You can confirm this by using steroid plotter and seeing the peaks and dip differences from daily injections compared to EOD, E3D, E5D or keep a log for yourself to notice the difference.

When I run tren I dont mix it with anything else. Just personal preference.

There is a second method that I won't go in to today, you can buy a 50ml or 100ml vial, empty all your compounds you are running, do the math, and draw daily. I wouldnt do this if Tren is one of the compounds. I'm sure you could but to me it doesnt sound like a good idea.

I've been doing the Sunday preload method for 3 years now and haven't had any issues besides a few knots here and there. Sometimes a few bent needles. A couple times I knocked over all my preloads being a dumby and the oil leaked out. Mistakes happen but nothing serious. I used to believe that SubQ didnt absorb as well, but my bloods tell me my body responds the same to IM as it does SubQ. Wish I had known about this when I first started. Good luck, hope this helps anyone tired of doing IM injections.