I would not say harder but definitely much slower than using a syringe with a 22-25 gauge needle.
Most are using 27-31 gauge and some tend to find the 27-29s easier to load but it is still not that difficult when using a 30-31.
Aside from the gauge used the viscosity of the carrier oil and dose of T will affect how long it takes to draw the oil from the vial.
Warming the vial prior to drawing will make it easier to pass through the needle when drawing/injecting.
I use a BD U-100 insulin syringe .5ml (50 unit) 30gauge 5/16 inch needle and inject Delatestryl (testosterone enanthate) 200mg/ml strength.
My protocol is 150mg/week (75mg every 3.5 days) so I draw (.375ml) and it takes under 2 minutes.
The main benefits are minimal pain/trauma to tissues and most importantly they are dead space syringes which result in the minimal waste of medication let alone you can draw/inject using the same needle.
Many use the 1ml fixed insulin syringes but you have the option to use the .5ml or even the .3ml syringes when injecting daily/EOD as the volume of oil is low and it is easier to read the markings for some when trying to draw an accurate dose.
When first starting trt I was using the standard 1ml fixed insulin syringe and eventually switched over to the .5ml as they are more compact and feel better in the hand when drawing/injecting and I can draw slightly quicker compared to the 1ml.
Thanks for the info. I did have some loss originally but I've gotten pretty proficient at it now. Might have to try the insulin ones if nothing else to save a little money.