Subtracting more than two large numbers

How do I subtract more than two large numbers when wanting a negative difference. I can easily subtract three numbers when I know for sure the difference will be positive. But when trying to subtract three numbers that will ultimately give me a negative difference. I always get the wrong answer.

For example: 862-135-264 = 463

How ever when trying to do 135-862-264

The answer that I got was -609

because I borrowed from the 3 to make the 5 into 15 which made the 3 into a 2.

I then subtracted 6 from 15 which gave me 9

I then borrowed from the 1 to make the 2 into 12

I subtracted 12 from 12 which gave me 0

And then did 8-2 which gave me 6

That lead me to -609 but this is incorrect

the right answer would be -991

What am i doing wrong and how can subtract three large numbers when the answer is going to be negative?