This is just a case of general cube understanding.
Don't worry, it comes with time and practice
The case(s) you presented are the same case, just with different colors.
In PBL this is:
U Adjacent swap, D adjecent swap; set up with "two bars in front"
As far as mirroring algs goes: check Chris' pages on Speedcubing.com. There should be a great page on translating algs.
For simple L / R mirrors: just perform your regular alg but with the other hand
I do this with N, J, T, U and A-perms
I encourage you to work it out pen and paper, it's not that hard.
You can check your solution by either doing it or with: http://www.strangepuzzle.com/mirrors.html
( also the home of JNet cube timer :rolleyes: )