I have Karbonn Titanium S5 Plus. I want to install CWM Recovery, but my phone model is not supported.
How to install CWM Recovery in it? Also, can I install it without using a PC?
Because CWM does not support your phone model, I assume you should search for an alternative recovery (TWRP, Philz).
Most installing methods require something like fastboot
or simply flashing an image to your phone, which is hard without a PC (Mobile ODIN may do the job, but I don't know about supported phone's).
For custom ROMs search xda-developers for your phone and that particular model in the appropriate subforum (look out for Android Development). There should be tutorials on how to install ROMs, recoveries, kernels etc., too.