Test signing my own driver with a custom certificate

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Hey all,
So I have created my first driver .sys file and I wanted to check if it works well. I'm getting message that "this driver has been blocked from loading" when I try to use StartService Windows API in order to run the driver. I'm using windows 8 64 bit and I've found out that my driver needs to be certificate signed. So I followed this guide: How to Test-Sign a Driver Package

I'm a bit confused about this signing and have some questions which hopefully someone would be willing to answer ^^.

While readingCreating a Catalog File for Test-Signing a Driver Package I came across:

A catalog file is not needed to install the following types of drivers:

    A boot-start driver.

    A driver that is installed by using an application that does not use a catalog file.

For these types of drivers, you have to embed a digital signature within the driver. For more information about this procedure, see Test-Signing a Driver through an Embedded Signature.

I would like to load/unload my driver by WinAPI. Does this mean I don't have to create this catalogue file in order to sign my driver? I've just followed the above link: Test-Signing a Driver through an embedded signature and signed my driver with the custom certificate. Then I copied this custom certificate to the Trusted Root Certificate Authorities but I still can't run the driver. It still says it's blocked from loading. I'm doing all on my test machine and TESTSIGNING boot option is enabled.