Applying for grants is an integral part of applying for a PhD course or for a Master's course leading to a PhD. There are various different types of grant, from studentships that pay for fees and provide maintenance, to travel and conference awards, as well as hardship funds. Getting a grant not only makes life much easier from a financial point of view but is also a significant morale booster and impressive on your CV. If you do not succeed in getting funding and intend to support yourself, e.g. by a bank loan, then you need to weigh up the pros and cons of studying part-time or full-time. Do discuss this with your supervisor.