I scale the importance of the 4Ms thus
coffee 53%
grinder 27%
machine 13%
you 7%
All the machine does is push hot water through properly ground coffee.
The Rocky is not a suitable espresso grinder because it is not stepless, the burrset is smallish and it retains a fair amount of coffee. Manufacturing tolerances leave something to be desired and some Rocky's are incapable of grinding for espresso. A used Macap MC4 or MC5, Mazzer Mini, Super Jolly or similar
stepless is a better investment. A grinder with the Trespade burrset like the Lux, Ascaso I-2, etc is also suitable. The new Baratza Preciso looks like it might be a winner. Buy a grinder that you can use for 5, 10, 15 years rather than 2 and your frustration level will diminish commensurately.
A Single Boiler Dual Use [hot water and steam from 1 boiler] machine is a PITA to make even one milk drink. Impossible for two in any reasonable amount of time as there is a long interval for the cycle from brew to steam and back. A used HX or DB or one of the low end Expobar or Bezzera machines would be more appropriate. If low cost is a must, a used Gaggia can be had for half the cost of a Silvia. Remember, the grinder is second only to the coffee.
You've found the fount of espresso knowledge here at H-B, so please use it. Since it appears you have no urgent immediate need, read up on equipment for the next several months. Put 50 or 100 euro per month into an account until cash = desire. In the long run, you'll be much happier than struggling with marginal equipment.
Less haste, more speed.
Besides, Silvia and Rocky are about as butt ugly a couple as you could meet 