Thevenins theorem + two diodes and a resistor using graphical solution
The voltage across each diode should be constant, probably about 0.7V but look it up in your assignment.  Give it a little thought, and this should already give you the current and voltage on R3.

Now convert R1/V into a Norton equivalent, and add R2 in parallel...you know the voltage and combined resistance, right?  You can figure out the current in that resistor combo.

Any current that doesn't go through R1/R2 will go through D1.  Whatever part of that that doesn't go through R3 goes through...?