Hello Fisayo,
I am Nigerian as well and I applied for my wife in August, 2018 and her Visa was approved on June 5th, 2019. The application is pretty straight forward, just make sure your follow the guide and make sure you ask lots of questions on this forum. Lots of knowledgeable people on this forum. To be honest, putting the application together is not easy, the sponsor has to be ready to put in the time. It took me a full month to put all the application together and I had 3 friends who went through the process to look through the application before I submitted. Your husband will need to be on top of the application bigtime for smooth sailing, I was following every step from Canada. Calling to book her medicals, calling VAC office for biometrics and calling and faxing Ghana.
Your husband can put in the application for you if he has the time to follow up with it. If you guys have the extra cash to play with then go with a Consultant. If you have any questions, feel free to email me.
Thanks.