I am surprised that no-one has already suggested this but I would strongly advise that you visit the real ship. Make a holiday or a couple of days of it. Take lots and lots of photographs around the Victory and visit the museum shop at Portsmouth Historical Dockyard at the same time. There you will find some of the best books on the ship ever published as well as there used to be a set of three superb plans of the ship. These plans include construction and one solely dedicated to the rigging. It is worth buying one of these as a working drawing to scribble on and, in particular crossing off lines one by one as you fit them to the model. It will also assist you in planning the rigging process so you can start in the centre of the vessel and work outwards, which will make life significantly easier. I did buy mine around 20 years ago so I hope they still do them.
The warnings mentioned earlier are justified, this is a mammoth task however good research and a careful methodical approach will give you the best chance. This could well take you a number of years but the reward of bringing a model to life will be worth it, especially if it is in memory of someone who has left it to you. You might even want to consider giving the model a good clean up and repaint before starting on the rigging, which should be the last task you do.
Most of all don't be afraid of asking questions nor of some of the answers if they are not what you were hoping to hear. There is a wealth of experience on here, members such as Footski have a lifetime of modelling behind them available to you, and don't be intimidated by pictures of completed beautifully built models of the ship. The builders of those also had many challenges and many years of work had to be put into them.