Glossary entry (derived from question below)
English term or phrase:
can just as easily have too much as too little
Spanish translation:
puede tenerla demasiado alta o demasiado baja con la misma facilidad
English term
Spain
Also an interpreter (medical, court)
Native in: Spanish 
Works in: English to Spanish, Spanish to English, French to Spanish, and 3 more.
can just as easily have too much as too little
Gracias.
Feb 20, 2019 11:14: changed "Kudoz queue" from "In queue" to "Public"
Feb 20, 2019 12:05: patinba changed "Level" from "PRO" to "Non-PRO"
Feb 21, 2019 11:53: Mónica Algazi Created KOG entry
Non-PRO (3): Pablo Cruz, Eugenia Martin, patinba
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Proposed translations
Uruguay
ATA-certified English-Spanish translator
Native in: Spanish (Variant: Latin American) 
Works in: English to Spanish
puede tenerla demasiado alta o demasiado baja con la misma facilidad
Spain
Let the words do their job
Native in: Spanish , Catalan
Works in: English to Spanish, English to Catalan, French to Spanish, and 7 more.
puede fácilmente oscilar entre estados de alta y baja autoestima
Spain
Golf, Literature and Religion Specialist
Native in: Spanish
Works in: English to Spanish, French to Spanish, Spanish
puede tener demasiada o demasiado poca con a misma facilidad
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Note added at 22 hrs (2019-02-21 09:36:59 GMT)
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Respondiendo a tu pregunta, me parece muy bien "perfectamente", pero invertiría el orden así: "puede perfectamente tener muy poca o demasiada autoestima"
También puedes decir: "puede perfectamente tener una autoestima muy escasa o excesiva" / "puede perfectamente tener escasa o excesiva autoestima"
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