I guess it can depend alittle,
the first chances I notice where pretty emotional, not like testroone did it but more the thing about you will look yourself in the mirrow a hundre times at days and notice all kind of small details wondering if thats because of T or not and looking into details of all kinds..
beside this my skin chanced pretty fast, (wich where one of the more annoying parts)
I also felt kinda restless and I notice I could work out more without getting tired.
the first day I say I could fell it in my body, but I cant really do that anymore.