Glossary entry (derived from question below)
Italian term or phrase:
una volta su mi attacco bene
English translation:
once I\'m up I get settled
Italian term
Germany
Look no further than here!
Native in: English 
Works in: German to English, French to English, Spanish to English, and 4 more.
su mi attacco bene
Conosco (name of the CEO of the person's new company) e mi fa vedere da vicino quel cavallo e mi rasserena facendomi proiettare in sella a quel cavallo, mi incoraggia ed io alla fine del nostro colloquio ci credo, mi prendo di coraggio e salgo in sella una volta su mi attacco bene ed inizio a trottare fino a cavalcarlo infatti nelle mie prime 4 settimane del pre-lancio del mercato italiano della (name of the new company).
Unfortunately I don't have a clue what this phrase means, whether it's an idiom or something else. So I've classified it as "general", even though I might be quite wrong.
Can anyone help out?
| 4 +1 | once I'm up I get settled |
Fiona Grace Peterson
|
| 4 +3 | I hold on tight |
Lisa Jane
|
| 4 | once I'm up, I'm well seated |
Tom in London
|
Non-PRO (1): Tom in London
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Proposed translations
Italy
Just what the doctor ordered
Native in: English (Variant: UK)
Works in: Italian to English
once I'm up I get settled
United Kingdom
Architecture, design, technical, etc.
Native in: English (Variant: British) 
Works in: Italian to English
once I'm up, I'm well seated
I hold on tight
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Note added at 3 hrs (2017-12-05 12:15:38 GMT)
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Salire in sella is a metaphor for being in charge, at the helm, in a position to guide the horse (the company) and take control.
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Note added at 3 hrs (2017-12-05 12:20:07 GMT)
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In English you could say something like
... I pluck up courage and take up the reins
To take up/over the reins is a very similar expression to the Italian.
https://dictionary.cambridge.org/dictionary/english/take-ove...
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Note added at 3 hrs (2017-12-05 12:23:23 GMT)
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Incidentally, in Italian you can also say prendere le redini meaning to take charge which is what this guy seems to be saying.
Discussion
Mi incoraggia ed io alla fine del nostro colloquio ci credo, mi prendo di coraggio e salgo in sella.
Una volta su, mi attacco bene ed inizio a trottare fino a cavalcarlo: infatti nelle mie prime 4 settimane del pre-lancio del mercato italiano della (name of the new company) [incomplete sentence].