If you're having difficulties with motivation, I recommend chopping the research paper into smaller chunks. By this, I mean giving yourself a detailed step-by-step to-do list so you can tackle each step one a time. This will make the task seem much less daunting.
Here's an example of how you can do this. For the sake of this example, let's say you're writing a paper on how to tie your shoes.
Goal: write a paper on how to tie your shoes
Needed to complete goal: Understand how to tie shoes, find resources on how to tie shoes, personal anecdotes on tying shoes, proofread, edit.
Step 1: Get a website or paper ready to write down notes and sources
Step 2: Find sources on how to tie your shoes effectively, written by shoe tying experts.
Step 3: Write down how these sources have helped you tie your own shoes.
Step 4: Write an outline
Step 5: Fill in the outline based on the information you already have
Step 6: Create a works-cited page
And so on...