I wouldn't worry about cutting any weight until you actually decide to compete, and even then, you might not bother until you've done a few competitions. Unless there are medals, records or something on the line, there isn't much harm in competing in the weight class above.
It shouldn't be too hard to get down to 58kg though.
I'm about 85-87kg now, I'll probably do a comp at 75kg within the next few years, cutting down from probably 94kg hah! I'm a nutcase like that though
