in Eigenregie
independently
To carry out or organize something independently and without outside professional help.
Wir haben den Umbau des Hauses komplett in Eigenregie gemacht.
We did the house renovation completely on our own.

self-direction
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independently
To carry out or organize something independently and without outside professional help.
Wir haben den Umbau des Hauses komplett in Eigenregie gemacht.
We did the house renovation completely on our own.

The word consists of 'eigen' (own) and 'die Regie' (direction). You may know 'Regie' from theater or film, where it means 'direction' or 'management'. So 'Eigenregie' literally means 'under one’s own direction'.
Die Party wurde in Eigenregie organisiert, ohne professionelle Planer.
The party was organized independently, without professional planners.
This word is used almost exclusively in the fixed expression 'in Eigenregie' (independently / on one’s own). It describes doing something yourself, usually without hiring professional help.
Sie hat ihre Hochzeit komplett in Eigenregie geplant.
She planned her wedding completely on her own.
The phrase 'in Eigenregie' (independently / on one’s own) is often used for projects for which one might normally hire experts. Typical examples are building a house, renovating an apartment, or organizing a move.
Viele Leute renovieren ihre Küche in Eigenregie, um Geld zu sparen.
Many people renovate their kitchen on their own to save money.
self-employed / independent
'selbstständig' and 'in Eigenregie' both describe that something is done without outside help or direction. 'selbstständig' is an adjective and can describe a person, an action, or a way of working: someone takes care of something alone and needs little guidance. 'in Eigenregie' is a fixed phrase and fits especially with projects, events, or work that you organize yourself, without outside professional help. 'selbstständig' is more general. 'in Eigenregie' sounds more strongly like one's own planning and responsibility for an entire undertaking.

Herr Richter organisiert die kleine Ausstellung in Eigenregie.
Mr. Richter is organizing the small exhibition on his own.
Das Kind zieht sich morgens schon selbstständig an.
The child already gets dressed independently in the morning.