if you go sub-q then you'll get a small knot under the skin .. theres absolutely nothing wrong with that , you'll be fine other than slower absorption time (some guys actually do their TRT injections of test Sub q in the stomach)..
be thankful you have no pain . most newbs have the pain of 'de-virignizing' the muscle for the first time . What type of test are you using ? I recommend test E for newer users being its usually the smoothest.
try Pinning Tren base/suspension ,, I been doing that lately . and yeah that shit has some PIP. (pip start about 1 min after injection)