Why was self-rule initially difficult for the Congo?
Self-rule was initially difficult because the Congolese had no experience running companies or governments. They also fought among themselves because they belonged to many different ethnic groups. The Congo was not unified as a nation.
Umpteen earlier posts about this topic, including questions worded exactly as all of yours:
http://www.jiskha.com/search/search.cgi?query=congo
Please read through these posts and any responses to them. You should find lots of help.
=)