It depends what you mean by not having enough money. If you're short of cash for the renovation, have you at least enough to do everything basic, like rewiring ( no point not doing that before you do other jobs), and necessary (like anything needed to keep it watertight, like gutters etc.? If you're short of the cash for things like that, it's probably not a good idea.
If you do have enough for that, how ok are you with living with most of it in its current state or worse (they tend to get worse visually before they get better as you strip them back) and doing the cosmetics* or extras like extensions a bit at a time, doing what you can yourself to save money and get things done without waiting for tradespeople to do everything? Living in a part-done house can really get you down, and even though some of us (like me) are slobs who stop noticing the mess most of the time, and can grit our teeth and think of the long term when it really does get to us, if you are ones of those who needs a house to be reasonably nice pretty much all over or you get stressed, I'd say, do not do it unless you have pots of money to get people in to do things quickly.
And remember, everything costs more than you think it will, and jobs do have a nasty habit of unveiling another one as you get into them.
But it can be fun, you can have it exactly as you want, and if you would be staying there a long time, the economics of it work out much better- especially if the area is good and you can increase its value without hittig a ceiling for the street/area. For us, it's worth it as we don't plan to move again.
(*I'd say a new bathroom and kitchen were cosmetic unless the current ones are not functioning or totally disgusting/dirty)