once u have done enough damage (i think its 500lp of damage, not sure) u can sit there and make arrows! this will get u fletching exp while at pest control so u get arrow shafts, tip and feathers and u can still make them whilst in PP, i do not suggest you to do this, but to get involved in the game, i also think u can use the points from pest control to get exp for fletching
If your not cheating, then the fastest way is to buy high level logs and fletch them. Since arrows and bows are sellable you'll be loosing only some of the money.
The total exp is 13,034,431 experience for a 99 stat on RuneScape.
There is a girl that has 99 on all skills her runescape name is 'xxphatmagexx'.
TRAIN
you train it
It would take a long time because you would have to fletch over 100,000 items depending on what you fletch. - Actually, depending on what you fletch willow longs, maple longs, then yew longs(starting at the soonest level you can fletch each). It should only take a week or two, if you play 6-8 hours a day. 3 weeks if you play 3-4. More if you rarely play. From 55 to 99 I'd say maybe 2-3 weeks.
There are no cheats in RUneScape. Getting level 99 in ANYTHING requires a considerable effort.
you keep training your skill to get up to lvl 99
it would prob take a month or 2 depending on your cash and the time you play
Fish Salmon & Trout in shilo village to 99.
By fighting.
Spend time on a stat and train it for experience. Once you get enough, you can be 99.