We have 100 points and have run into a few minor issues.
1) You can't un-bank or un-borrow.
2) You can't reserve 2 different types of reservations in case those flaky relatives back out. [Some use a strategy to book both a 1 bedroom and a 2 bedroom and cancel what they don't need.]
3) Making a week long II trade is out of the question, or just impractical in our case.
I would suggest that your friend start with 50 points instead of 25, and to purchase at a resort with low
point charts. With 50 points, your friend could go every year if they wanted, or could have the flexibility to bank/borrow to stay on weekends, stay in a 1 bedroom, etc. if they wished.
The biggest thing that I have learned is GO EARLY IN YOUR USE YEAR!!!
If you have to cancel, even within the 60 day mark, you have most of the year to re-group and try again. If you only have a set vacation week per year, then I wouldn't consider purchasing anything that would require banking/borrowing at all.
The OP should also be concerned about cancelling at the last minute because of family emergencies. With 100 points, I'm concerned that we may ever have to forfeit points. I would not be happy at all if I lost 3 years worth of points because of it!!
My last concern for the OP is whether or not they can afford everything else that goes with
DVC. If you are frugal, and are wanting to pay cash that is o.k.; if you can only get financing for 25 points but want your family of 4 to fly from Timbuktu every 3 years, you may be setting yourself up for failure as park tickets, transportation, food, and souvenirs cost a pretty penny.