Honestly, if you have a decent level of English, which you should in the first place to qualify, you will be able to handle EE by yourself, without a consultancy. Those are very popular in Nepal, though I am not quite sure why. They certainly cannot help you get a job (legally at least), nor can they increase your points. So you might as well put your money towards your PR costs instead. From what I've seen (and read) on this forum, the whole process is fairly straightforward as long as you pay attention to the instructions.
Good luck!