It is by relying on craving that craving is to be abandoned… 
“‘This body comes into being through craving. And yet it is by relying on craving that craving is to be abandoned.’ Thus was it said.
And in reference to what was it said? There is the case, sister, where a monk hears, ‘The monk named such-and-such, they say, through the ending of the fermentations, has entered & remains in the fermentation-free awareness-release & discernment-release, having known & realized them for himself in the here & now.’
The thought occurs to him, ‘I hope that I, too, will—through the ending of the fermentations—enter & remain in the fermentation-free awareness-release & discernment-release, having known & realized them for myself in the here & now.’ Then he eventually abandons craving, having relied on craving.
‘This body comes into being through craving. And yet it is by relying on craving that craving is to be abandoned.’ Thus was it said. And in reference to this was it said.
– AN4.159
And here we see Ananda teaching a Brahman how it is possible that one could abandon desire by means of desire:
“If that’s so, Master Ananda, then it’s an endless path, and not one with an end, for it’s impossible that one could abandon desire by means of desire.”
“In that case, brahman, let me question you on this matter. Answer as you see fit. What do you think: Didn’t you first have desire, thinking, ‘I’ll go to the park,’ and then when you reached the park, wasn’t that particular desire allayed?”
“Yes, sir.”
“Didn’t you first have persistence, thinking, ‘I’ll go to the park,’ and then when you reached the park, wasn’t that particular persistence allayed?”
“Yes, sir.”
“Didn’t you first have the intent, thinking, ‘I’ll go to the park,’ and then when you reached the park, wasn’t that particular intent allayed?”
“Yes, sir.”
“Didn’t you first have [an act of] discrimination, thinking, ‘I’ll go to the park,’ and then when you reached the park, wasn’t that particular act of discrimination allayed?”
“Yes, sir.”
“So it is with an arahant whose mental effluents are ended, who has reached fulfillment, done the task, laid down the burden, attained the true goal, totally destroyed the fetter of becoming, and who is released through right gnosis.
Whatever desire he first had for the attainment of arahantship, on attaining arahantship that particular desire is allayed.
Whatever persistence he first had for the attainment of arahantship, on attaining arahantship that particular persistence is allayed.
Whatever intent he first had for the attainment of arahantship, on attaining arahantship that particular intent is allayed.
Whatever discrimination he first had for the attainment of arahantship, on attaining arahantship that particular discrimination is allayed.
So what do you think, brahman? Is this an endless path, or one with an end?”
"You’re right, Master Ananda. This is a path with an end, and not an endless one. Magnificent, Master Ananda! Magnificent!
– SN51.15 (EN)
Fear not, crave for Nibbana as much as you want. 