former

I had all the swaps down cold but still couldn't manage to answer a single question correctly when doing interest rate swaps in different currencies, there just seemed to be too many moving parts

former

Equities: inflation forcasting together with Residual income valuation approach is hard.
long process, multistep calculations, messing up 1 small calculation can screw you up

corporate finance: replacement project NPV valuation;
long process, many factors to be taken into account: depretiation, ending value, selling value etc. again, messing up 1 step will get you no where.

FRA: translation and remeasurement in hyperinflationary economy for cash and non-cash items

Derivatives: dynamic/delta hedging; swaps